Performance Core Carbon Often referred to as PC Carbon or PCC, these fins are highly responsive and feature strategically placed carbon that’s designed to complement the fin template. PCC fins suit fast surfing and are favored by power surfers who like to perform explosive turns on critical parts of the wave. Ideal Conditions A wide range of conditions, particularly good in critical overhead waves. Board Types Designed to fit the FCS II Fin System. Performance shortboards and hybrid models. Fin Family Reactor: Find Speed. Speed, tight turns and snaps. Size: X-Small: Under 55Kg / 120 Lbs Small: 55Kg - 70Kg / 120 - 155 Lbs Medium: 65Kg - 80Kg / 145 - 175 Lbs Large: 75Kg - 90Kg / 165 - 200 Lbs X-Large: Over 85Kg / 190 Lbs