4/0, 18" Silk Black Braided Non-Absorbable Suture with Reverse Cutting C-3 Needle (3/8 circle), Box of 12 Suture Sets. Black-dyed sutures specifically made for wound closure applications. Sold with silver C-3 needle measuring 13 mm. Silk sutures do not absorb into the mouth. Sterilized and ready to use. 4-0 Perma-Hand Braided Silk Sutures are non-absorbable sutures intended for closing wounds. These sterile sutures have a black dye, measure 18" per pack, and are composed of organic protein with a special wax coating.Perma-Hand Braided Silk Sutures are delivered using the special C-3 needle with a cutting edge reverse point type.