Package of 8 Hobie Cat Part # 11323000. These are the adjustable back batten caps for the mainsail on the Hobie 14,16,17,18, 21 and Wave and Getaway. These caps are made of a much stronger material that the old white caps. You need 8 of these for a Hobie 16 mainsail to replace all of the old ones. These caps fit 1″ wide Hobie battens.