Robline Opti Mainsheet Tapered. A specialized line the Opti Main Sheet is double tapered - thinner at the ends thicker in the centre where it provides excellent hand grip. The smaller line diameter at the ends reduces friction in blocks and sheaves for lower physical effort on the sailor.It is constructed of a mix of Dyneema with a polyester yarn for high loads low stretch and excellent grip. Specifications for Robline Tapered Opti Mainsheet: Manufacturer: Robline Color: Black Quantity: 1 Features of Robline Tapered Opti Mainsheet Color - Blue/ Silver Total Length - 7M Section Diameters/mm - 6/9/6 Section Lengths/Mm - 1.5/ 2.5/ 3 Note: This sheet is not symmetric one taper is longer than the other - the long taper runs through the blocks on the boom the shorter taper runs through the cockpit sole blocks. Package Contents: Robline Tapered Opti Mainsheet Robline MT-OPTI: Opti Mainsheet Tapered