4/0, 18" Nylon Black Monofilament Non-absorbable Suture with Cuticular Reverse Cutting C-6 Needle (3/8 Circle), Box of 12 Suture Sets. Black sutures specifically made for wound closure applications. Smoothly penetrates into the tissue. With a bending-resistant cutting point. Sold with C6 needle measuring 19 mm and with 3/8 circle curvature. 4-0 Nylon Monofilament Sutures are non-absorbable sutures intended for closing wounds. These sterile sutures have a black dye, measure 18" per pack, and have a smooth surface that prevents tissue ingrowth and trauma during insertion.They are delivered using the special C6 needle with a reverse cutting needlepoint type. This needle has a channel specially fitted to the size of sutures.