Futures Fins Performance 4.5 Fibreglass Single Longboard Fin - Black/GreyFutures Fins Performance 4. 5" Fibreglass Single Longboard Fin Black Grey The Performance 4. 5 fin is made from a solid fiberglass panel, utilizes an all around template shape and is to be ridden as a thruster, when combined with your favorite side fins. Features Template Category Performance Longboard Construction Fiberglass Size X Small Longboard Centre Fin Area 15. 30 Height 4. 60 Base 4. 50 Foil 50 50