The lightweight alternative to a block, with no moving parts this is an extremely low maintainance item. Hard anodized with PTFE coating to provide the smoothest wear resistant surface possible. These low friction rings can be used in various applications: EX3001 as lead ring for control lines, EX3002 as Optimist halyard block and EX3003 as Optimist mainsheet block. MODEL D1 D2 Ø T WEIGHT Ø19 19 7 4,5 8,5 3,5 g Ø25 25 9 6 10 6 g Ø38 38 15 9 13 15,5