UC Chamaleon 55mm/90a (4)
Sold in sets of 4. Spacers not included.
These wheels are best suited for a flat setup, where all four wheels touch the ground on each skate. Purchase 2 sets (8 wheels) if you plan to use them for a flat setup.
If you have not skated Undercover wheels before then you probably need smaller spacers for inbetween the bearings of each wheel. These can be purchased here.