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The Futures Fins QD2 3.75 Alpha Quad Rear Fin in Carbon & AquaThe QD2 3.75 Alpha is a small size balanced quad rear fin with a ride number of 6.5. Alpha’s C6 composite material is carbon and air-infused making it lighter than honeycomb. The responsive flex characteristics of C6 combined with the neutral QD2 template and symmetrical foil make this set ideal for pairing with your favourite front fins, creating the ideal quad option.