You need 8 wheels for a pair of roller skates (2 x 4 packs or 1 x 8 pack)

Original clay roller skate wheel in a MINI version 45mm.  Available in original two tne brown and black.  45mm x 30mm.

Fo-Mac wheels are retro-style wheels using a compression molding process.  The materials used are much different than urethane wheels of today.  The formulas used are unique and different from each other and can offer a different skating feel.  Many factors will contribute to the performance of a wheel like this; such as weight, floor material, temperature, etc. 

Hardest - Premier, Mini-Mac, Freestyle, Slick, Harmony
Hard - All Amarican Plus, All American Gold, All American Dream