[Material]Garage Door Rollers are made of nylon,stainless steel,sturdy structure [Size Information]Garage Door Roller (length) measures approx 11.4cm/4.5inch,wheel diameter 46mm / 1.8",can fit all 2inch tracks [Feature]Quiet garage door rollers are designed to operate smoothly and quietly,ensuring minimal noise effect during opening and closing [Smooth Rolling]The nylon garage door rollers built with precision bearings that provide effortless gliding along the tracks,allowing the door to open and close seamlessly [Replace Parts]direct replacement accessories for your outdated or worn out parts, Weight: 2.95860355604 Pounds, Manufacturer: ALCXAZS