Nylon garage door rollers, 2-inch wheel, 11-ball bearing, bag of 10. Choose between 4-inch or 7-inch stem length for your hinge setup. This 11-ball bearing makes these smoother and quieter than plain sleeve rollers but they are a step below the 13-ball version. Good middle ground if you want less noise without paying top dollar. Ten rollers covers most single residential doors. When your current rollers are grinding or the door shakes going up, worn rollers are usually the first thing to check. Measure the stem on your old ones before you pick a size.