Spyderco Endura 4 are distinguished by their skeletonized stainless steel liners and lightweight injection-molded fiberglass-reinforced-nylon (FRN) handles. The flagship version of the design includes a stout saber-ground VG-10 stainless steel blade. Its blade is supported by a sturdy back lock mechanism that locks it securely open when in use yet allows easy ambidextrous lock release. A Bi-Directional Texturing pattern on the black handle ensures a secure non-slip grip and a four-position hourglass pocket clip supports left or right-side tip-up or tip-down carry. Lightweight capable and completely ambidextrous.