The FCS PG-7 Thruster Surfboard Fin features beautiful carbon inside foil and a hand lay-up flex pattern, providing an incredibly solid and true feel for surfers of all levels. Carbon inserts in the base create a stiff foundation to effectively flex and store energy when the fin is under pressure during turns and nose riding. Performance Glass material characteristics and flex pattern are identical to traditional fiberglass fins, a stiff base with subtle, responsive tip flex. Great transition fins for surfers moving from glass-on fins to the convenience, accuracy and performance of FCS.