Spyderco tagged the updating/upgrading process with the term CQI- Constant Quality Improvement. During the Endura and Delica's CQI journey Spyderco tweaked ergonomics, refined blade steels and fine-tuned their performance countless times. It has screw construction making cleaning and adjusting easier. The fiberglass reinforced nylon handles come molded with Bi-Directional Texturing for preferred traction and improved ergonomics. Inside the handle dual skeletonized stainless steel liners make the knife stronger without adding weight and make an anchor for all external and internal components to attach through adding sturdiness and rigidity. Their VG-10 blades are flat saber-ground with a stronger tip and larger 13mm opening hole. Added to the blade's spine is slip resistant jimping. Phosphor bronze washers smooth out the open/close action and the clip is upgraded to a four-way tip-up, tip-down, left- or right-handed clip.