JT steel front sprockets are manufactured using Japanese SCM420 Chromoly or C49 high carbon steel. Accurately machined with the tightest of tolerances to guarantee a perfect fit and chain alignment. Fully heat treated / Fitment: Triumph: 19-20 1200 Scrambler XC; 19-20 1200 Scrambler XE; 16-20 1200 Thruxton (R) (RS)