Made of surgical-grade stainless steel they have a smooth, satin-sheen finish that won't reflect any light making it hard to see your work. The spectacular tips and joins are precisely machined and are lightwieght and strong. They are available in six different lengths ranging from 9" (23 cm) through 40" (100 cm). The 12" (30 cm) and longer lengths have a bend in the needle to help ease hand fatigue. Needle size is permanently laser imprinted on each circular.