Features:* brand new and high quality*Made of fine material, and realistic to use*The diameter of the glass opening must be 4-6mm.*Suitable for 3-6mm Thickness Glass Doors.*Made of Nylon, Brass and Ball Bearing, it's free of Any Noise and *Have the Advantage of Strong Load-bearing Capacity.*Good Tolerance of Water and Anti-Rust Property.*User-Friendly and Easy to Replace and Install.Specifications:Material: Nylon + Brass + Ball BearingColor: WhiteDiameter Size: 22mmThickness: 7mmPackage Contents:4/8 * Shower Door RollersNote:1. The real coloration of the item may be slightly various from the images shown on online page caused by many factors resembling brightness of your computer screen and light-weight brightness.2. Please allow slight guide measurement deviation for the data.