Quality Materials: The shower door rollers are made of zinc alloy and ABS, ensuring sturdiness, durability, and a long service life. Noise Reduction: The 4 double rollers (2 upper and 2 lower) can effectively reduce the noise when closing the sliding shower door. Size and Compatibility: Wheel diameter: 23 mm; suitable for glass doors with a thickness of 3 to 6 mm, suitable for most shower and massage rooms. Easy Installation: Easily replace the worn rollers of your shower room without professional help, contact us if you have any questions. Versatility: The shower door rollers are suitable for various shower partitions, shower rooms, and massage rooms with glass doors of 4 to 6 mm thickness.