Package Includes: You will receive 12 nylon garage door rollers, providing sufficient quantity for daily use and replacement, ideal for maintaining your garage door system. Quiet and Smooth Operation: These nylon garage door rollers are constructed with high-quality nylon material and 6200ZZ bearings, offering durability and performance. They help reduce rotational friction between the rollers and the shaft, allowing your garage door to open and close more quietly and smoothly. Sealed Garage Door Roller Design: The rollers feature reinforced double-wall bearing covers and enclosed bearings that help protect against dust, dirt, and moisture ingress, contributing to extended roller lifespan and reliable performance over time. Simple Installation: To install, slightly bend the track at the seam to remove and replace the roller, then move the door to reposition the roller (repeat on the other side). Alternatively, remove the screws securing the bracket to the door, secure the cable before releasing the bottom bracket under spring tension, clip the cable to the track, slide off the old roller, install the new one, and reattach the support components. Easy to Replace: These black garage door wheels are designed for straightforward installation and replacement. Using just one basic tool, you can remove old, worn, or noisy rollers and restore quiet operation to your garage door. Durable and Rust Resistant: Made from enhanced nylon, these rollers are rust resistant. The sealed 6200ZZ ball bearing design supports strong performance and long service life, capable of withstanding over 10,000 operational cycles. Size: Diameter of roller: approximately 1.8 inches Total length: approximately 7 inches Color: black Material: nylon Package Contents: 1 set x Nylon garage door rollers Note: The package includes only the items listed above. Other products are not included. Note: Lighting reflections and display settings may cause slight variations between the color shown in the image and the actual product. Measurement error allowance is +/- 1-3 cm.