MATERIAL:High Quality Environmental friendly Polyurethane Replacement Wheels for Suitcase,Roller Skate,Caster Board, Scooter,Roller Blades capable of fitting a 80mm wheel.Very Quiet Running ,Anti-abrasive, Absorbs Shock The material is made of high-quality PU, and the bearing is upgraded to carbon steel, which is more durable. The height difference between the shafts of the bearings is 1mm, and it is more flexible to choose a size. SIZE:Replacement Wheel OD:80mm,Wheel Wide: 24mm,Bearing ID:6mmBearing Depth:24mm EASY TO INSTALL:To Remove The Original Wheel With A Hacksaw At The Space, Then Install The New Wheel With The Repair Kit. size: 80 x 24mm Material: PU+carbon steel colour: black Package Contents: 1 Pair x Suitcase Replacement Wheels 4 x bearing 4 x Washers 2 x Wrenches 2 x Rivets 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.