... , TPR, TPU, TPE, HDPE, PMMA) etc.5) Surface Treatment: High quality polish, powder coating, Chrome/Nickel/Zinc(white, blue, yellow, black)plating ... , Anodize, electrophoresis, sandblasting etc...6) Tolerance: +/- 0.0005inch, also accord with GB6414 High temperature teflon coating baking tray of aluminum die casting