High Quality: High quality pom pom plastic. No decompression and no loss of money: you bought a camera system and it broke down, you think in horror that you now have to buy a new one? To forget There are replacement shower door wheels that will fit any sliding system in your home. If you have trouble sliding shower doors, use this quick fix and don't waste your money Use anywhere: shower door slides for shower, massage machine , the bathtub, the jacuzzi and even the furniture accessories. Make sure the door(s) open easily and smoothly. Replace your faulty system. Premium Quality Casters Bell Component: Smooth bearing bearings with slight forward or backward movement to apply forces for shower enclosures. controls movement in the specified direction. This gives the product even more durability and a longer lifespan Steel part of the wheel: 9mm diameter x 3mm height Type: 4 door rollers shower. Wheel thickness: 5mm. Comes with screws. Suitable for 4-6mm thick shower door. Roller diameter: 20mm, inner hole 6mm, fixed with M6 screw. The pulley is copper pom wheel and the screw is stainless steel. Corrosion and rust resistant steel, good comprehensive performance. Pulley bearing capacity, good stability, small coefficient of friction, good noiseless effect. Easy installation, commonly used for bathroom sliding glass door panel.