Quick answer
Choose a PMU needle based on the intended technique, machine compatibility, and your training – not just by the needle's name. The needle count, grouping, diameter, and taper affect how the pigment is delivered and the level of control the practitioner has. Sterility, single-use, and intact packaging are always fundamental requirements.
A cartridge is a technical interface between machine, hand, and skin. Two needles with similar names can behave differently depending on the membrane, taper, diameter, machine stroke, and working technique. Therefore, the choice should always be tested and documented within the method you are trained in.
For whom: trained PMU artists and students under supervision · Read time: approximately 10 minutes
How to read a needle configuration
| Part | What it describes | Practical significance |
|---|---|---|
| Count | How many needles are in the group | Affects coverage, precision, and how the group meets the skin |
| Grouping | For example, round liner, round shader, or magnum | Shapes the imprint and how lines, pixels, or softer areas can be built |
| Diameter | The thickness of the individual needles | Can affect pigment flow, feel, and level of detail |
| Taper | How long the needle tip tapers | Affects contact and how the needle is perceived in the chosen technique |
| Cartridge/membrane | The assembly located in the machine's handpiece | Must be compatible and contribute to a safe barrier according to the manufacturer |
Common groupings
Round Liner (RL)
The needles are in a tight, round grouping. Often used when the practitioner needs a concentrated contact point and high precision.
Round Shader (RS)
A round but more open grouping that can be used for softer pixel work and gradual build-up within the right technique.
Magnum
The needles are arranged in rows and cover a wider surface. Requires specific training, angle control, and an understanding of the chosen treatment.
Microblading blade
A row of needles in a manual tool. This is a different method than machine PMU and should be chosen based on blade shape, diameter, and training.
A safe selection process
- Define the technique. Determine if the goal is, for example, fine lines, pixel-based shading, or a broader work area.
- Check compatibility. Verify that the cartridge fits the machine and handpiece and that the membrane meets system requirements.
- Select configuration. Match the grouping, diameter, and taper to the method you have mastered.
- Adjust the machine. Needle choice cannot be separated from stroke length, speed, hand movement, and depth control.
- Document. Save the product, lot/batch, configuration, and relevant settings in the treatment records.
- Dispose correctly. Needles and cartridges are sterile, single-use products and must be handled as sharp waste according to protocol.
Control before every treatment
- The packaging is intact, sterile, and within the expiration date.
- Configuration and cartridge are compatible with the machine.
- Membrane and needle movement function according to the manufacturer.
- Lot or batch information can be documented.
- A new cartridge is used for every client and discarded immediately afterwards.
- The choice is within the practitioner's training and the salon's hygiene protocol.
Frequently asked questions
What does 1RL and 3RL mean?
The number usually indicates the number of needles in the group, and RL stands for Round Liner. Exact diameter and taper need to be read separately on the product.
Do all PMU cartridges fit all machines?
No. Even standard-like connections can differ. Always check the machine and cartridge manufacturer's compatibility.
Which needle is used for powder brows?
Several configurations can be used depending on the technique, machine, and training. Choose according to the protocol you were trained in, not based on a single general recommendation.
Is a thinner needle always better for details?
Not necessarily. Stability, pigment flow, skin type, hand movement, and machine settings all affect the result together.
Can a PMU needle be reused?
No. Sterile PMU needles and cartridges are single-use products and must be disposed of after the treatment.
