The following is sprockets detailed information:
1) Material: 45# steel, 16 # Mn, A3 steel
2) Specification: 415, 420, 428, 428H, 520...Etc
3) Front gear: 13T, 14T, 15T, 16T, 17T...Etc
4) Rear gear: 34T, 35T, 36T, 37T, 38T, 57T...Etc
5) Heat treatment: High frenquency quenching, Carburization
6) Surface treatment: Sandblasting, Galvanized, Cr-plating...Etc
7) FOB price: USD0.3-5.0
8) MOQ: 1000 piece/pieces
9) Payment: L/C, T/T
10) Delivertime: Within 25 days
11) Package: Plastic bag then in carton

We can produce all kinds of sprocket as per buyers drawing as well.