Dear Sir , We are a manufacturer for motorcycle sprocket in Taiwan. Our front sprocket with the material of scm435. Rear sprocket with 7075-T6 aluminum alloy . It is a high quality sprocket. Our sprocket used for Yamaha , KTM , Honda ,Ducati , Suzuki , Kawasaki and Aprilia . We produce sprocket for street bike and dirt bike. we have special treatment in rear sprocket , therefore it will be more hard than original 7075-T6. If possible I hope could cooperate with you in sprocket. Jacky Hsu