The Hyperlite Power binding offers excellent fit and support, enhancing your wakeboarding performance. - ALRSHOCK PLATE M It says this. Probably around size M? I bought it with the board, but it doesn't fit, so I'm selling it. I haven't used it myself. I don't know how much the previous owner used it, but I don't think there's any damage. It's a used item, so please no returns, no complaints, no refunds (3N). I'm also listing it elsewhere, so it may be suddenly removed.