Material: Brass shower door roller, and the screws are made of stainless steel, corrosion resistant, non-rusting, durable and have a long service life. Bearing Component: Smooth operation of the door, slight forward or backward movement, effortless shower rollers for shower cabins, hydromassage boxes clearly perform their assigned task, distribute the mass of glass, control movement in the given direction. This gives the product even more durability and a longer lifespan. Waterproof: When using a special ultra-sealing grease with PTFE content for shower enclosures, the service life of the wheels is much longer. It certainly works 100% to prevent problems, protects products from corrosion, creates a long-lasting water-repellent protective layer and helps mechanisms extend life. Uses: Shower door rollers are what makes it easy to open the shower door, rollers for massage shower stalls, tubs, hot tubs and even for furniture trim. Product Use: Used for the bathroom glass sliding door Product material: nylon roller + copper chuck. Product specification: Diameter 25 mm Quantity delivered: 4 pieces