Tune your childs skates to perfection The Rollerblade Kids Wheels Kit 72/80A combines a set of small fast starting wheels with butter smooth SG5 bearings The kit makes old inline skates ride like theyre fresh off the retail shelf 8 pack includes 8 72mm wheels 72mm wheels are smaller for slower overall speeds Softer 80A durometer wheels absorb vibration for comfortable cruising SG5 bearings offer smooth roll 6 mm spacers work in conjunction with the bearings