5/0, 18" Chromic Gut Absorbable Suture with Reverse-Cutting C-17 Needle (3/8 circle), Box of 12 Suture Sets. Colour is beige. Suture size is 4-0. 12mm circle reverse cutting. 12/Box. Equivalent to Look 536B. HSB – House Brand Dentistry sutures can be trusted by surgeons to streamline the stitching process. Key features of the 4-0 surgical plain gut suture are its beige colour and 12mm circle reserve cutting.