The Acumen Schimatle permanent makeup needles are made of high-quality stainless steel, which s a good user experience. 100 Percent E.O gas sterilization, individually packaged, to ensure people's health and avoid infection. These microblading needles can only suit for Charmant Machine or some standard Screw Design permanent makeup machine. The needles are smooth and stable quality,screw design head and inner spring can control the flexibility well. Material: 316B stailess steel, needle length at 58mm. Pre-sterilized by E.O. Gas,Individually packed. Color: clear Disposable eyebrow tattoo needles and ready for use. Features: 1R: fits for eyebrow or lip liner and positioning. 3R & 5R fits for small fog eyebrow or eyeliner. 5F & 7F fit for fog eyebrow or lip style positioning, 7F speed is faster than 5F. Diameter: 0.3MM