The carbon gives you a stiffer fin and the performance core makes sure it's as light as possible go for the PC Carbon if you want a snappy responsive fin that is very light.These fins are designed to work with the FCS II Reactor side fins from the thruster set they are supplied as two fins to go in the rear fin plugs of a quad set-up.OVERVIEWFast reacting fin for performing tight radius turns.Upright template with flat foil on the side fins allows for acute directional changes.Designed for surfers who like to stay tight in the pocket and perform aerial manoeuvres.IDEAL CONDITIONSSuits hollow waves and punchy beach breaks.BOARD TYPESRecommended for performance shortboards with moderate-to-low rocker.*Please Note: this fin is designed to be used exclusively with the FCS II Fin System and will not fit in the traditional FCS Dual Plug System. How Many fins?This is supplied as a set of t :: Unisex > Surf Accessories. Designed for surfers who like to stay tight in the pocket and perform aerial manoeuvresBase: 4.03\ / 102mmFoil: 80/20Fast reacting fin for performing tight radius turnsDepth: 4.40\ / 112mmArea: 12.63\² / 8150mm²Upright template with flat foil on the side fins allows for acute directional\n changesSweep:28.5°Please Note: Designed to be used only with the FCS II Fin System. it will\n not fit in the traditional FCS Dual Plug SystemIdeal Conditions: Suits hollow waves and punchy beach breaksBoard Types: Recommended for performance shortboards with moderate-to-low\n rockerRecommended Rider Weight: 65kg - 80kg Size: one size.