Ballet K2-K6 K-Shank Size 2-6 (.002 - .006") 24 karat Gold Coated Needles Package of 50 needles -- Product Details Ballet K2-K6 Gold: Needle shaft diameter: "K" 0.80 mm, requires K-Shank Needle Holder Needle filament/tip diameter: 0.002 - 0.006 inches Needle Surface: Stainless steel needle is plated with a thin 24 karat gold The Ballet gold needle is plated with nickel-free, 24 karat gold. Gold has many acknowledged medical uses from acupuncture needles to ear piercing posts, and its benefits are clear in electrolysis. Redness and swelling are reduced and the skin rapidly returns to normal after even the most delicate treatments, particularly red vein and skin tag work. Treatment recommendation: The 24kt gold needle responds to the needs of clients who suffer from allergies and sensitive skin and whose skin reacts negatively to standard stainless steel probes. Other Ballet Gold Needle sizes available: “F” Shank (1.25 mm): .002″ .003″ .004″ .005″ .006″ “K” Shank (0.80 mm): .002″ .003″ .004″ .005″ .006″