Product Specification of our Brake Disc/Rotor: 1) Long service life & stable performancemancemance 2) 100% crucial dimension inspection 3) 100% qualification 4) Low noise standard for casting is HT250. Standard for machining is SAE-j431. 5) Factory supplier & various automobile brake discsdiscsdiscs About Us: Shandong Zhengnuo Group Co., Ltd is one special manufacturer of brake discs in China,More than 100 kinds for domestic and international markets. Meanwhile,we can also manufacture products in accordance with the customer's requirements and pictures.