Feature●68mm 78A Indoor Sport Court Inline Wheels●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).●Includes 8 Wheels and 16 Abec 5 BearingsDescription These are a first quality, blank 68mm 78a indoor wheel. Abec 5 Bearings Included.