Set of 3 fins that are Single Tab compatible; Surf Twin Fin Set + Trailer Fin (2+1 Fins) - Solid Fiberglass and Nylon- for Single Tab Surf Boards, Shortboard Twin fins with a small stabiliser (centre fin) which adds control while maintaining manouverability of a twin fin setup; You can with or without the stabiliser fin; Perfect for modern fish and twin fin model surfboards. Nylon and Fibreglass strongest fin construction and has the best flex; The fins have a matt finish, ensuring a , fast surface. Twin fins are flat foil - Base: 133mm & 5.236 inch, Height: 135mm & 5.315 inch Trailer Fin is double foil - Base: 89mm & 3.5 inch, Height: 86mm & 3.386 inch Applicable People: Unisex Outdoor Activity: Water Sport Surfing Model: Single tab base Outdoor Activity: Surfboard Accessories color:Black Material:Nylon+glass fiber Package Contents: 1 x Surfboard Fins kit(3pcs) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.