Spyderco’s Proficient FB36CFP is a fixed blade designed by Chris Claycomb. It has a satin CPM-S90V steel blade and Carbon Fiber handle. This knife comes with a leather sheath for easy carry. FB36CFP PROFICIENT – Designed by Chris Claycomb of Buscraft UK, the Proficient is a high-tech expression of classic bushcraft knife design. It features a full-flat ground CPM-S90V blade steel, machined and contoured carbon fiber handle scales, and a leather sheath for comfortable belt carry.