- Black braided silk USP 4-0(1.5 Metric), 3/8 circle reverse cutting 19 mm needle 75cm. - Black braided silk suture - durasil / orisilk is a nonabsorbable, sterile, surgical suture composed of an organic protein called fibroin. - This protein is derived from the domesticated species Bombyx mori (B. More) of the family Bombycidae. - These are processed to remove the natural waxes and gums. - This suture is dyed black and coated with a special wax mixture, it is indicated for use in general soft tissue approximation and/or ligation, including use in Cardiovascular, ophthalmic, and neurological procedures. **For further product information, please contact Chat Support**