The BSD Walla Sprocket is built tough, like a brick outhouse! Hence the all over brick wall graphic. Built from fully 3D CNC machined 7075-T6 alloy with a dual thickness construction that's 8mm thick at the edges & tapers to 6mm at the center to help save weight. A 15/16" center hole as standard can fit on all cranks with the supplied 19mm & 22mm top hat washers. section Product Specs TYPE: Bolt On
Material: Alloy WEIGHT: 90.7g (3.2oz)