Material: Copper + stainless steel + nylon, bold copper shaft, , and , this gives the product more and longer service life Shower Door Roller FEATURES: Shower rollers for curved doors bearing capacity, stability; Small friction coefficient, mute effect. silent effect is , can be a replacement for your old or broken roller This gives the product even more and longer service life. INSTALLATION CONVENIENCE: First use a screwdriver to loosen the shower roller wheels and remove it, then replace the pulley, tighten the matching bolt to complete the replacement of a pulley. It is a good helper for bathroom sliding doors., Manufacturer: LQZAXSRDR