Need to dial in your foil setup just right? Shimming is where the magic happens.

You can throw a shim under the tail wing and feel a big difference straight away—more lift, more drive, a whole new vibe underfoot. Or, go one step further and shim the mast itself. That keeps your front and rear wings aligned but changes how your board sits and trims through the water. Subtle tweak, major impact.

On my home-built board, the nose was riding a bit low, so I popped in a 1-degree nose-up mast shim. Instantly smoother, especially when you're carving into a wave or pumping out the back. Game changer.

Sure, Duotone sells some, but honestly… they look kinda sketchy. This one’s shaped to properly match your mast base—clean fit, no pressure points, no fiddling around. Just set it and go.