This ultimate Optimist mainsheet is tapered and made of abrasion resistant PES material. It’s 7 meter long and tapered from 9.0 to 6.5 mm. Thick and soft where it touches your hand. Thin and smooth elsewhere for free running control. Tapered on both ends. Long enough to create a 4:1 Optimist mainsheet with 2 boom blocks. Line structure is approximately: 2.0 meter: 6.5 mm2.0 meter: 9.0 mm3.0 meter: 6.5 mm EX1379