The Ronix Eight.3 Wakesurf Shaper 1in Boat Shim is designed to level out your velcro model Ronix Eight.3 wakesurf shaper. These are designed to fit between your boat and wakesurf shaper to help "level" the shaper out. These work great if your boat has a stepped hull, like older mastercraft models. The shim does come with velcro on both sides so that it will stick to both the shaper and boat. Shims can also be stacked on top of each other in the event that you need to level the shaper out even more. The shims are made the same way as the shaper and will float in the event that they pop off the boat.