... Brief Description of Znic Coated Sprocketznic coated sprocket for motorcycle;znic coated gear for motorcycleChain415,415H,420,428,428H,520,530 etcTeethFront ... High frequency hardening on the teeth for 1045 steel Carburization for 1023 steel (plain iron) Front sprockets are hardened by meshbeltfurnace2) Surfaced ... guarantee most preferential treatment to customers! znic coated sprocket for motorcycle