Thank you for viewing. BURTON RE:FLEX 3D disc in yellow, a rare item. RE:FLEX is a revolutionary binding system developed by Burton, where the binding flexes in conjunction with the board's flex. Currently, 2-hole and 4-hole discs are included, but the disc for older 3D boards is very rare. Burton once sold these as a separate, standalone option. This item is being sold in what appears to be unused condition. Free shipping and same-day dispatch.