Heavy-Duty Construction You Can Trust: Each roller combines high-strength nylon wheels with a reinforced steel stem, built to withstand frequent opening and closing of standard residential garage doors used multiple times per day. Dual Sealed Bearings for Long-Term Reliability: The dual rubber seal design helps block dust, moisture, and debris from entering the bearing, maintaining consistent performance and extending service life with minimal maintenance. delivering noticeably quieter and smoother operation compared to worn metal or basic plastic rollers. garage door rollers are suitable for easy replacement using common household tools, making them a dependable choice for DIY homeowners., Weight: 2.9541943108 pounds, Manufacturer: Prterver