This listing contains 78A Durometer Inline Wheels which are designed for Roller Hockey use. These wheels are perfect for indoor skating, and utilize the standard size 608 bearing hub. If you only wish to use your wheels on outdoor skates, you should look for wheels with a harder duromer (80A or higher). Listing Includes: Qty x8 Wheels and Abec 9 Bearings, Measuring 76mm in Diameter and 78A in Hardness. Do you need a tool, spacers, oil, or a hop up kit? Make sure to check out our other listings for accessories you may need!