Surftech NSP Butter Knife SurfboardButter Knife is a Carl Schaper creation. Best known for his longboards, Hawaiian based Carl Schaper created this shape as the pinnacle of his mini tank designs. The Butter Knife in CSE construction with its classic outlines, perfect performance longboard rockers, and well thought out volumes is a winner across the board. Suitable for all abilities, surfers get to ride these as single fins in smaller conditions and discover their nose riding potential.