MATERIAL:High Quality Environmental friendly Polyurethane Replacement Wheels for Suitcase,Roller Skate,Caster Board, Scooter, capable of fitting a 80mm wheel. Quiet Running ,Anti-abrasive, Absorbs Shock The material is made of high-quality PU, and the 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 a size. SIZE:Replacement Wheel OD:80mm,Wheel Wide: 24mm, 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 4 x 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.