Sterile, disposable 2-piece needle manufactured from diamond-drawn, medical-grade stainless steel. The Sterex F3R Stainless Steel needles are best-selling disposable two-piece needles, the perfect solution for safe, sterile hair removal. Made from quality diamond-drawn, medical-grade stainless steel. More sizes available. F2 - Ideal for very fine upper lip hair. F3 - Centre to upper lip and fine hair. F4 - Chin hair or strong outer lip hairs. F5 - Strong thick hairs such as body hair.