Capped nylon garage door rollers, 2-inch wheel, 13-ball bearing, sold in a bag of 10. The clear nylon cap covers the bearings so dust and grit do not get inside and wear them out prematurely. Choose between 4-inch or 7-inch stem length depending on your hinge setup. Rated at 125 lbs per roller and 20,000 cycles on a 12-foot door. They are a good step up from the basic non-bearing nylon rollers if you want a quieter, smoother door but do not want to pay for steel. Ten rollers is enough for most single residential doors.