What You Will Get: You will receive 24 white nylon garage door rollers; Enough quantity to meet your daily use and replacement needs, the garage door roller dimension can fit the vast majority of residential garage doors Quiet and Smooth: The garage door wheels are mainly made of quality nylon and 6200ZZ bearings, smooth and high load, sturdy and durable, the quality nylon material reduces noise well, making your garage door quiet and smooth Proper Size to Apply: The diameter of the sealed garage door roller is about 1.8 inches for 2 inches track, 4.7 inches long rod, and the thickness of the rollers is about 0.5 inches. The proper size can make the roller run more smoothly on the track, which can fit the vast majority of residential garage doors Sealed Garage Door Roller: The garage door replacement rollers are designed with the reinforced double-walled bearing cap, the cap provides extra protection to the 6200ZZ preventing dust and grime, moisture from entering the bearing, which