Strictly according to IATF 16949 quality certification system process production;Teflon or iron ball bowl, make the product wear-resistant, longer life;The roughness of ball surface is less than 0.6 and so smooth, The hardness was HRC28-36 for Wear-Resisting and Reduced Friction.unify product quality standards to all customers;Product development stage all through durability test, pull force test, high and low temperature test, welding strength test,corrosion test and other tests, online production 100% through torsion test, to ensure the best quality;Products cover Germany, France, Italy, the United States, Japan, South Korea and other car series, exported to Europe, North America, South America and other countries and regions;Tell consumer when changing chassis product, accomplish left and right sides to change in pairs.