Enhanced Durability: Featuring top- nylon shells and robust steel wheels with a shiny zinc-plated , these rollers are built to last. Their tough construction ensures long-lasting performance and reliability for your garage door system. Smooth Operation: Designed with a clever combination of wheel and axle, these rollers smoothly guide your garage door along the track system. The premium sealed 13-ball bearing ensures fluid motion and reduces friction for effortless operation. Easy Installation: Installing rollers is a breeze - simply them onto either side of your door effortlessly. This straightforward process makes it easy to upgrade your garage door without professional help. Noise Reduction: The 2inch quiet nylon wheels significantly reduce garage door opening and closing noise, providing a quieter and more pleasant environment. Enjoy a smoother and less disruptive operation every time you use your garage. Versatile Compatibility: With a 4inch stem and a 7/16inch diameter, these rollers are compatible with most standard garage door systems. Their universal design makes them a perfect replacement or upgrade for worn-out or noisy rollers. Colour:White Material:Nylon + Metal Size:46mmx120mm Package Contents: 12 x Garage Door Roller Wheel Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.