3X3 and 5X3 Special Stipple Shader Cartridges Specially designed with 3 groups and 5 groups of 3RL for dot shading. It can improve the efficiency of dot shading.

1. The back blister paper is easy to open
2. Accurate Slot design fits 99% of pen machines
3. The membrane inside is not easy to pull apart
4. Membrane with 4 Thickened Bars， more durable
5. Soft and Strong Flexibility Membrane Material
6. Soldering material is better than the other brands
7. All the needles with CE certificate were sterilized by EO GAS
8. Needles are more sharp and neat under the microscope
9. Medical PC Material for the shell is better than the other brands with PVC Material