Prolene sutures (clear or pigmented) are non-absorbable, sterile surgical sutures composed of an isotactic crystalline stereoisomer of polypropylene, a synthetic linear polyolefin. The suture is pigment blue to enhance visibility. Prolene sutures are indicated for use in general soft tissue approximating and/or ligation, including use in cardiovascular, ophthalmic procedures and neurological procedures. Prolene sutures have been trusted by cardiovascular surgeons for over 40 years having been used in over 100 million people worldwide.