PREMIUM NYLON MATERIALOur garage door rollers are made of highquality nylon material and 6200ZZ bearings, which is sturdy and durable, more stable and quieter than metal rollers and other materials, and smoother than previous rollers, very suitable for 2 inch garage doors. HIGHLEVEL DESIGNThe nylon garage door frame has a galvanized coating to prevent rust. The design of the reinforced doublewalled bearing cage and the sealed 6200ZZ ball bearing make it have performance and super long life. The garage door rollers can withstand more than 10000 cycles under a load of 150 pounds. MORE STABLE AND QUIETERThe 6200ZZ ball bearing on the nylon garage door wheels rotates smoothly, and the highquality nylon material greatly reduces noise, which can reduce the noise of your garage door by 75, ensuring that your garage door runs smoothly and quietly. You can use it with . EASY TO INSTALL AND STANDARD SIZEGarage door wheels are easy to install and replace. You can throw away the old, worn, noisy or damaged rollers and replace them with our quiet new garage door rollers. The actual diameter of the garage door is 1.81 inches and the thickness of the rollers is 12 inches, which fits the 2 inch track in garage doors. Color White Material Nylonmetal Size 12046mm Package contents 12Nylon Garage Door Only the above package content, other products are not included. Note Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is13 cm.