Sprint Run alert! This limited Sprint Run of the Endura 4 model is outfitted with textured burgundy FRN handle scales, and a PD#1 steel blade with a TiCN finish, all making for an extremely elegant looking and durable knife. Yes, you asked for it and Spyderco listened! The blade on this Endura is durable Micro-Melt PD#1 steel with extreme wear-resistance.. With that said, this pocket knife has all the high-quality we've come to expect. The spine jimping extends from the ramp to the top of the handle. The Spyderco original thumb hole on the blade allows ambidextrous one-hand opening for right or left handers and the phosphor bronze washers at the pivot make the blade action smooth. The Endura has a lightweight FRN (fiberglass reinforced nylon) handle with skeletonized stainless steel liners and a strong back lock mechanism. The handle features screw construction for quick, simple cleaning and adjustment. The FRN scales utilize Spyderco's patented Bi-Directional Texturing to keep your hand from slipping under pressure. The pocket clip is 4-way reversible for tip-up/down and left/right carry.