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: Aprilia: 11-16 1200 Dorsoduro; 07-16 750 Dorsoduro ABS, Factory ABS; 07-16 750 SL Shiver ABS