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: Kawasaki: 81-82 Z1000K1/2 LTD ; 81-83 Z1000R2 ; 84-86 Z1100R1