The Spyderco Endura 4 is an improved version of the original Endura. The Endura has been produced for decades and continues to be a fan favorite. It is available in a variety of blade steels and colors, along with saber and full flat grinds. The Endura 4 knives with FRN handles have skeletonized stainless steel liners for added strength. The pocket clips have been redesigned and are now side-to-side and end-to-end reversible. Check out this iconic knife below.