Masuma ball joints use the most modern design - polyoxymethylene polymer (POM 500P) ball joints. It is a highly crystalline polymer with a smooth glossy surface: wear-resistant, oxidation and stain resistant, self-lubricating and oil-tight. It is characterized by high strength and dimensional stability. The metal parts of the ball joints are made of Cr40 alloy steel with mandatory hardening. The special technology of mirror processing ensures the surface roughness of the ball pin is no more than 0.4 microns, which significantly increases the life of the hinge. The design and processing technology of the ball joint ensures that the ball joint will not jump out of its original seat even with high angular loads. Ball joints guarantee 12 months. Wherever you bought or installed a part, within a year you have the right to return it by simply providing him with a receipt or other document confirming the purchase date and price. Even if you are not a certified auto mechanic and installed the part yourself in your garage, just keep your purchase receipt and, if a problem arises, you can always return the part. Masuma is a global brand of auto parts, components and consumables. The main specialization of the brand: resource parts for post-warranty service of Japanese cars. The company's strategy is to offer consumers the best ratio of reliability and cost of spare parts.