This is the thickest twin fin in the collection. It must be 3" thick at least. It paddles and catches waves unbelievably well. But as you can see in the photo it only wants to go straight while I'm trying to get it to go down the line. The original owner couldn't afford or couldn't get hold of any astro deck. So instead he used industrial grip tape, the type you'd use on a slippery stair case. Its guaranteed to leave your knees bleeding every surf.