Ethicon Sutures. Silk Thread. 632G 3-0 X-1 18" 12/BoxPerma Hand Silk Black Braided Sutures are a nonabsorbable, sterile, surgical suture composed of an organic protein. The sutures are processed to remove the natural waxes and gums, dyed black and coated with a special wax mixture. 3/0, 18" Plain Gut Absorbable Suture with Reverse Cutting X-1 Needle (1/2 circle), Box of 12 Suture Sets.