Material: Copper + POM wheel, thickened copper shaft, wear-resistant, no rust, anti-corrosion, making the product more durable and service life longer. Easy installation, less parts for pulley installation, simple operation and easy installation. Wheel size: 25mm diameter shower door roller, suitable for glass doors with a thickness of 4-6mm. Provides 15-17mm mounting opening. Wheel features: Strong bearing capacity, ultra-quiet, stable push-pull light pull, labor-saving, and safe to use. Suitable for most shower rooms, steam rooms. Material Copper, POM Roller Diameter 25mm Quantity 8 Pieces Individual Weight About 70g Type Shower Door Roller Brand Unbranded/Generic MPN MEM94927170566 EAN 4894927170566 .