Base: 4.265'' / 108mm; Base: 4.33''/ 110mm; Foil: Flat; Performance Core: Designed to deliver the feeling of a traditional fibreglass fin with the added performance of reduced weight; RTM (Resin Transfer Moulding) produces a lightweight fin with remarkable flex, a smooth feel & an impressive aesthetic; Performance Unique tip design in stiff carbon creates lift, maintains speed over dead sections, & adds stability in turbulent water; Great for SUP's and longboards; :: Unisex > Surf Accessories Size: one size.