JT Sprockets 520 Steel Rear Sprocket Honda Cbr600Rr / F4i JT Sprockets steel sprockets stand out for their durability and lighter weight, benefiting from advanced computer design and precision metal cutting technology. This innovational approach ensures a blend of high performance and reduced mass for the ultimate riding experience. Features: 520 pitch JT steel rear sprockets are made from C49 high carbon steel Heat-treated and bead blasted to reduce material surface tension