Nylon and copper-good elasticity, good abrasion resistance Economical sets of 8 rollers, several spare parts Measuring wheel diameter-25mm</ p> The perfect substitute - rollers need to be replaced over time. Repair only requires a screwdriver Suitable for - Suitable for glass door openings: 10~12mm; 12mm is recommended. Thickness : 4-6mm. For shower doors and massage rooms, bathtubs, massage bathtubs or any other furniture The shower door rail guide is supplied with the screw cover. The spring mechanism is also compatible with arched doors. Single shower door rollers/sliding rails/wheels/pulleys Shower door roller replacement is suitable for most shower rooms Suitable for most shower rooms, shower rooms and steam rooms Easy to use. The robust and well-designed project Perfect match for replacing the defective shower door roller. Product and original Package includes: 8 * glass door pulley We only sell rollers, the rest are accessories</p > 1. Manual measurement, there will be errors in size, please refer to the actual size 2. Due to the difference in light and screen, the color of the product may be slightly different from the picture.