Description This item is well made of premium material for durable and practical use. It allows the door to operate smoother, quieter, less stress on the opener (saving you that costly repair on the opener), less stress on the door hinges. These rollers alone will make a huge difference they dramatically reduce vibrations and noise caused by metal rollers. Feature - Color: Random Color. - Material: Nylon. - Size: 12.00X4.50X4.50cm;/4.72X1.77X1.77in; - Made of material, sturdy and durable. - Nylon shells around steel wheels, for the ultimate combination of quiet and durable. - Replacement rollers for residential and commercial garage doors.Package list: 1 x Heavy Duty Ball-bearings Nylon Garage Door Rollers With Stem