Featuring an exclusive profile designed for the optimal balance of speed and slide. 65mm to fit all sizes of Balance frames as well as most other low profile frames on the market if you have a soulplate that accommodates for a bigger wheel sizes. The 90A hardness provides a ride with the perfect balance of performance and durability. Sold in packs of 4, but we highly recommended you ride them flat. 50/50 is the oldest brand to make replaceable aggressive inline skate frames. It has been revived in recent years by Lawrence Ingraham. Follow him on his youtube page:http://www.youtube.com/backtoblading More information about the 50/50 brand can be found here:https://www.balancedist.com/shop-50-50/5050-58mm-85a-wheels More information about wheels in general here:http://thisissoul.com/general-info-on-inline-skating-wheels The width of inline skate wheels are always the same, If you are not sure these wheels will fit your skate, you can always contact us
