Specifications: Easy to color. Super sharp and elastic Material: 316L Stainless Steel. Diameter of needle:0.15mm Individually packed,for single use only Suit the manual tattoo pen. The manual pen is not included. Blade is made of medical grade stainless steel Superior quality and complies with international cosmetology and medical requirements Needles are sharp and elastic, make the eyebrow line beautiful. Package Included: 50pcs X 0.15mm Disposable Nano Needle Blades