FutureSurfboard Fins Twin FT1 Fiberglass Outline: G. McNabb Height: 5.14 in-13.1 cm Base: 4.8 in-12.2 cm Area: 19.79 in-127.68 cm Fin set includes 3.25 in-8.3 cm trailer fin Twin fin feel with added thrust and smoothness from rail to rail. Available Materials: Fiber Glass (red, blue, clear, smoke) Natural Composite (Custom only- call shop to order natural composite material)