PC: Performance Core material and construction is designed to deliver the feeling of a traditional fibreglass fin with the added performance of reduced weight. The RTM (Resin Transfer Moulding) process produces a lightweight fin with remarkable flex, a smooth feel and an impressive aesthetic. * Optimum weight range: 55kg - 70kg ; 120 - 155 lbs * Base: 4.37 in. ; Depth: 4.37 in. ; Area: 13.71 sq.in. ; Sweep: 35.5° * Foil: Flat