Nylon and Copper - Good elasticity, good wear resistance Cost-effective - Set of 8 rollers, multiple replacements, spare parts in one order Measure - Wheel diameter - 25mm, wheel thickness: 5.5mm, total length: about 32mm A perfect replacement - Over time, the rollers need to be replaced. Only a screwdriver is needed in addition for repair Suitable for - For glass door openings: 10~12mm; 12mm recommended. Thickness: 4-6mm. For shower doors and massage cabins, bathtubs, jacuzzi or any other furniture Replace a broken bearing Shower Door Track Guides Comes with screw covers. Spring-loaded mechanism, also compatible with curved doors. With screws and plastic covers Single Shower Door Rollers/Glides/Wheels/Pulleys Replacement Shower Door Roller Fits Most Shower Enclosures Suitable for most shower partitions, shower enclosures and steam cabins Shower Door Rollers, Shower Enclosure Rollers for Bathroom Easy Installation Size: 25 mmColor: 8 Pieces