Solder type: RLHLT (Round Liner Half Long Taper / Contour) Sharp sharpening. - Presence of a membrane: is. - Number of pieces per pack: 20 pcs. Defender Nano Systems are designed for the most demanding permanent makeup artists. Cartridges use a lightweight membrane to prevent ink from entering the machine and improve needle return. Sterilized using ethylene oxide gas. The sharpest needle in the tattoo industry is 8.5mm. Japanese surgical steel, grade AISI 316L In cartridges