Noise Reduction Efficiency: These garage door rollers are designed to effectively reduce garage door operational noise by over 80%, providing a quieter and more pleasant environment. High-Quality Bearings: Equipped with 6200- precision bearings, these rollers smooth rotation under high loads, enhancing the efficiency and of your garage door. Advanced Sealing Technology: The double seal design prevents dust and moisture from entering the bearings, ensuring optimal performance and durability in environmental conditions. Colour:Black Material:Nylon + Metal Size:About 46x120mm Package Contents: 10 Pack x Garage Door Roller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.