The Optimist centreboard bungy from Optiparts is made of 6mm shockcord with red pvc handle to retain the Optimist centreboard in it’s case. The legal handle to keep your Optimist centreboard in place and your Optimist hiking strap up too. Comes in a complete set with two sizes of tubing, shockcord and 3mm Vectran rope to keep the shockcord in place.