Tattoo Cartridge Needles: RL, RS, RM and Magnum Explained
Choosing the right tattoo cartridge needle is one of the most important decisions a tattoo artist makes. The needle configuration affects how ink is deposited, how the needle moves across the skin, and the final appearance of the tattoo.
For beginners, terms such as RL, RS, RM and Magnum can seem confusing. But once you understand what each configuration is designed for, selecting the right cartridge becomes much easier.
In this guide, we'll explain the most common tattoo cartridge needle configurations and their typical uses.
What Are Tattoo Cartridge Needles?
Tattoo cartridge needles are pre-assembled needle modules designed to fit compatible tattoo machines and grips.
Unlike traditional needle-and-bar setups, cartridge systems make needle changes faster and more convenient. Different configurations are available for different tattooing techniques, including lining, shading, blending and color packing.
The four common categories are:
- RL – Round Liner
- RS – Round Shader
- RM – Round Magnum
- Magnum – Flat/Curved Magnum configurations
Let's look at each one.
1. RL – Round Liner
RL stands for Round Liner.
Round liner cartridges have needles arranged closely together in a circular configuration. They are primarily designed for creating clean, defined lines.
Common uses of RL cartridges:
- Outlining
- Fine-line tattoos
- Lettering
- Small details
- Dotwork
- Tattoo details
- Precision work
RL cartridges are available in different needle counts. Smaller configurations can be useful for delicate details, while larger configurations can create thicker lines.
Example
A 3RL has three needles arranged in a round configuration, while a 7RL has seven needles.
Best for:
✦ Lines
✦ Outlines
✦ Fine details
✦ Lettering
2. RS – Round Shader
RS stands for Round Shader.
Round shader needles have a similar circular arrangement to round liners, but the needles are generally spaced farther apart.
This configuration allows artists to deposit ink over a broader area while producing softer results than a typical round liner.
Common uses of RS cartridges:
- Small-area shading
- Soft shading
- Filling small areas
- Blending
- Some color work
- Small traditional-style tattoos
Because the needles are more spread out than an RL, RS cartridges can cover more skin with each pass.
Best for:
✦ Soft shading
✦ Small fills
✦ Blending
✦ Small color areas
3. RM – Round Magnum
RM stands for Round Magnum.
Round magnum cartridges are arranged in a curved or rounded configuration. They are designed to provide broader coverage while producing a softer application.
They are particularly popular for artists working with shading and smooth transitions.
Common uses of RM cartridges:
- Smooth shading
- Grey wash
- Blending
- Realism
- Soft transitions
- Larger shaded areas
The rounded configuration can help artists create smooth gradients and softer transitions.
Best for:
✦ Smooth shading
✦ Grey wash
✦ Realism
✦ Blending
✦ Gradients
4. Magnum Needles
Magnum cartridges are designed with needles arranged in multiple rows, creating a wider configuration.
They are among the most commonly used configurations for larger areas of shading and color packing.
There are several types of magnum configurations, including:
Standard Magnum
A standard magnum has multiple rows of needles arranged in a relatively flat configuration.
It can be used for:
- Shading
- Color packing
- Large areas
- Blackwork
- Traditional tattooing
Curved Magnum
Curved magnums have slightly curved needle arrangements.
They are commonly preferred for:
- Smooth shading
- Blending
- Color packing
- Large areas
- Softer transitions
The curved arrangement can provide a smoother feel when moving across the skin.
RL vs RS vs RM vs Magnum
| Needle Type | Full Name | Main Use |
|---|---|---|
| RL | Round Liner | Lines & details |
| RS | Round Shader | Soft shading & small fills |
| RM | Round Magnum | Smooth shading & blending |
| Magnum | Magnum | Large shading & color packing |
How Do You Choose the Right Cartridge?
There is no single cartridge that is perfect for every tattoo. The right choice depends on your tattoo style, design size, technique and desired result.
For Fine Lines
Consider RL configurations, particularly smaller needle groupings.
For Bold Lines
Larger RL configurations can be suitable when you need a stronger, wider line.
For Small Shading
RS cartridges can be useful for smaller shaded areas and softer applications.
For Smooth Shading
RM or curved magnum cartridges are commonly used when creating smooth gradients and transitions.
For Color Packing
Magnum configurations are popular for covering larger areas and packing color.
For Large Black & Grey Work
Artists often use RM and magnum configurations depending on their preferred technique and the desired level of softness.
Understanding Needle Counts
The number before the configuration indicates the approximate number of needles in the grouping.
For example:
- 3RL = 3 needles, Round Liner
- 5RL = 5 needles, Round Liner
- 7RS = 7 needles, Round Shader
- 9RM = 9 needles, Round Magnum
As the needle grouping becomes larger, the cartridge generally covers a wider area.
However, needle diameter, taper, spacing and configuration also affect the final result. Two cartridges with the same needle count can behave differently if their specifications are different.
Needle Diameter and Taper Also Matter
Choosing between RL, RS, RM and Magnum is only part of selecting the right cartridge.
Artists should also consider needle diameter and taper.
Needle Diameter
Common tattoo needle diameters include sizes such as:
- 0.25 mm
- 0.30 mm
- 0.35 mm
- 0.40 mm
Smaller diameters are often selected for finer work, while larger diameters can provide broader ink flow.
Taper
Taper refers to the length and shape of the needle tip.
Different tapers can influence ink flow and how the needle interacts with the skin.
Therefore, when selecting cartridges, don't look only at the configuration. Consider the complete specification.
Cartridge Needles for Different Tattoo Styles
Different tattoo styles can benefit from different needle configurations.
Fine-Line Tattoo
Common choices include smaller RL configurations for precision and delicate details.
Traditional Tattoo
Artists may use a combination of RL, RS and Magnum cartridges depending on the design.
Black & Grey
RL, RS, RM and Magnum configurations can all have a role, particularly when creating different levels of detail and shading.
Realism
Artists often use various RL, RM and Magnum configurations to achieve fine details, smooth gradients and realistic shading.
Color Packing
Magnum cartridges are commonly used for efficient coverage of larger colored areas.
Why Cartridge Quality Matters
The configuration is important, but cartridge quality is equally important.
A professional tattoo cartridge should have:
- Consistent needle grouping
- Secure needle construction
- Smooth needle movement
- Reliable membrane performance
- Consistent ink flow
- Clean manufacturing
- Compatibility with the artist's machine and grip
Poor-quality cartridges can make it difficult to achieve consistent results and may affect the artist's control during a tattoo session.
Always use cartridges from reputable manufacturers and follow appropriate hygiene and single-use practices.
Final Thoughts
Understanding RL, RS, RM and Magnum tattoo cartridge needles makes it easier to select the right tool for different tattooing techniques.
Remember the basic rule:
RL = Lines
RS = Small Shading
RM = Smooth Shading & Blending
Magnum = Large Shading & Color Packing
As you gain experience, you will develop your own preferred combinations based on your machine, hand speed, tattoo style and technique.
The best cartridge is ultimately the one that gives you the control, consistency and result you are looking for.
Frequently Asked Questions
Which tattoo cartridge is best for lining?
Round Liner (RL) cartridges are specifically designed for lining and detailed work.
Which cartridge is best for shading?
RS, RM and Magnum configurations can all be used for shading, depending on the area and the desired finish.
What is the difference between RL and RS?
RL cartridges have a tighter needle grouping and are primarily designed for lines. RS cartridges have a more spread-out grouping and are generally used for shading and small fills.
What is RM used for?
RM, or Round Magnum, cartridges are commonly used for smooth shading, blending, grey wash and larger shaded areas.
Are Magnum cartridges good for color packing?
Yes. Magnum configurations are commonly used for efficiently covering larger areas and packing color.
Can one cartridge be used for everything?
It is possible to work with a limited selection, but professional artists generally use different configurations to achieve different lines, shades, blends and color coverage.
Are tattoo cartridge needles reusable?
Tattoo cartridges intended for single use should be disposed of after use according to appropriate sharps and biohazard disposal procedures. Always follow local regulations and professional hygiene standards.
