... nodular iron, cast iron, steel, alloy etc(we can aslo do as per customer's request)2 ... treatment:polishing, plating, oxidation, phosphating, etc(we can aslo do as per customer's request)3 ... TD71, 120,TD100, 144, 127Toyota piston ring5A, 3ZZ, IS-U, 5K, 2C, 2L-T, 2L-TE, 2KD, ... We can develop new items for you especially.Any questions, please contact us soon, and we will be gald to help you in any way we can ...