BALLET STERILE DISPOSABLE ELECTROLYSIS NEEDLES. The Ballet needle is manufactured with both a precise point and a mirror-like surface polish. The rounded tapered point of the needle will assist the electrologist in locating the follicle opening and upon insertion the needle will slide smoothly and accurately to the base of the follicle. • K3 needle - 0.075 mm (0.003”) • Stainless steel needles: ideal for patients with strong healthy skin who respond well to electrolysis treatment.