Computer designed to achieve ultimate strength at minimum weight, JT combines leading-edge technology with top materials to produce the ultimate quality sprocket range with unbeatable value, Every sprocket meets or exceeds the highest possible quality standards, Sprockets are heat-treated and beadblasted to reduce material surface tension, Front sprockets are made with top-quality Japanese C45 high carbon steel and SCM415 chromoly steel alloy, Steel rear sprockets are made with top-quality Japanese C45 high carbon steel, Aluminum rear sprockets are made with high strength Austrian 7075 T-6 anodized aluminum, JT aluminum sprockets are about 30% lighter than a comparable steel equivalent, which reduces un-sprung rotating weight and improves performance