Product Description The REA Pro Core fiberglass tri fin set from Rainbow was designed to give the rider more drive, speed, and power. Comes with three fins.4.38" base and 4.5" depth. Rainbow REA Pro Core Surfboard Fin Set - FCS Base - Yellow / Black at Surfboards.com Browse all Surfboards.com deals $85.95 In Stock at Surfboards.com Buy Now at Surfboards.com Secure checkout Easy returns or compare prices Amazon eBay Product Details Brand Rainbow Rainbow