Introducing Kumano Ai
"Kumano Ai" are the small cylinders that hold the fin tight in your board.
There are two types of Kumano Ai :
Ai for regular surfboards and SUP
(usually made with fiberglass, carbon or epoxy)
Ai for inflatable SUP (iSUP) and Foam Surfboards and any board using "Air7 brand fin boxes"
How to use fins with Kumano Ai :
insert into your fin box.
slide the fin forward
lock down & go !