These are 76mm, 78a inline wheels. Made for indoor use. These will work great for any type of skating your into, i.e. Hockey, Recreational, Fitness, Cruising. If you need some new wheels for your indoor blades, these first quality wheels will do the job well. Listing Includes: Qty x8 Wheels, Measuring 76mm in Diameter, and 78A in Hardness. You will also receive enough Abec 5 bearings for you wheels! You will want to make sure you have the correct spacers . If you have 8mm axles you will need 8mm x 10mm spacers, if you have 6mm axles (most common) you will need stepped spacers. We have these available for purchase in our Other Listings!