UPSURF Future Keel Fins Surfboard Fins Clear Yellow/Black Fiberglass MR Twin Fins Surf Quilhas Single Tabs Twin Keel

["Slice smooth sweeping arcs in the waves, with the stiff flex and balanced template of these twin keel fins (similar template to Futures K2 Keel fins). Designed for twin-fin fish surfboards, both modern and retro boards.","Size : Base: 4.96\" Height: 5.55\"","Material: fiberglass. Solid fiberglass provides surfers with support while surfing, allowing them to glide easily through the waves.","Single tab fin box compatible.","DURABILITY: Tested and thrashed by UPSURF professional group to make sure what buyers ordered are durable enough for usage."]