If you already own a Delica or Endura, you have one of the bestselling knives Spyderco makes. These models are a bit different from the normal C10 Endura4 and C11 Delica 4 Lightweights. They are in a range of handle colors with full-flat ground blades. The blades are full flat-ground VG-10 with a thinner highly refined cutting edge and a 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.