We have provided two kind of sprockets, normal non-metallic sprockets from centrifugal mold casting and replaceable teeth sprocket with stainless steel wheel.All sprocket is designed for the 720s &
NH78 chain. Except the driven sprockets, all sprockets are DL (Dual Life) type with odd number of teeth.Futhermore, newly designed teeth replaceable sprockets have much strong structure due to the
stainless steel wheel inside of them.