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- Opti Blade Centerboard Hold-Down Bungy by Optiparts EX1113
6 mm dinghy shockcord with red PVC handle to retain the Optimist daggerboard in it's case. The legal handle to keep your daggerboard in place and your hiking strap up too. Comes in a complete set with 2 sizes of tubing, shockcord and 3 mm Vectran rope to keep the shock cord in place.