Perma Sharp sutures are made with 300 series stainless steel, the ideal alloy for sutures. 300 series stainless steel give Perma Sharp sutures a finer point geometry for smoother penetration. This stronger alloy composition also gives Perma Sharp sutures increased ductile strength. So, if the needle does bend, it is less likely to break when reshaping. Perma Sharp's unique laser-drilled needles are designed to reduce tissue disruption. The needle diameter is actually adjusted according to the size of suture material that is attached, for a smooth transition from the needle to the material. Monofilament material made from polypropylene polymers has excellent tissue compatibility.