In 1990 Spyderco shook things up by introducing the Delica. First of their kind on the market,these folders opened up the knife market to lightweight performance, one-hand open pocketknives that just about everyone could afford. The Delica settled as Spyderco's bestseller and their improvement hasn't slowed since. Refinement has been so ongoing and continual Spyderco tagged the updating/upgrading process with the term CQI- Constant Quality Improvement. During the Delica's CQI journey Spyderco tweaked ergonomics, refined blade steels and fine-tuned their performance countless times. They are an evolutionary work in progress and the next level is here with the new Delica4.The Delica4 now have 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.