Mute nylon roller: Our roller wheel adopts mute nylon wheels, no scratches on the slip, soft and stable. You can open and close the door comfortably and quietly. Package included: 2 sets of wheel kits for sliding doors, can form two pulleys. It is recommended to install 2 to 4 pulleys per cabinet door. Pulley panel is 7.4cm long, 3.7cm wide; pulley diameter 3cm, thickness 1.3cm. Easy to use: quick installation button, the upper guide wheel adopts copper button, the retractable upper wheel is convenient for the installation of the door leaf. Cylindrical catheter, horizontal rotation structure, smooth sliding without jamming. Applications: Suitable for sliding cabinet doors, sliding bathroom doors, sliding balcony doors, windows, cupboards, wardrobes, display cases and shoe cabinets. Product material: Made of cold rolled steel and high strength nylon, the surface is treated with advanced spray, wear resistant and durable for long term use. Specifications: Material: cold rolled steel and high resistance nylon Size: as shown Color: Black Package Include: Set of 2 Sliding Door Rollers Note: This does not include other things, the color is based on the first picture, and other pictures only show the effect Due to the differences between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thank you!