They are dual bearing wheels with the exact design of a real skate wheel, down to the point that they are symmetrical. The back fits partially over the truck like a real skate wheel and therefore they can be used only on blackriver trucks, hand shapen techdeck trucks, or ytrucks. These wheels are the ultimate wheel in durability, realism, and smoothness. Because these wheels sit further over the truck like a real skate wheel, they are great for smaller decks.

NOTE: On BRR trucks you will need to glue the nut because the axle is too short for dual bearings, check out my tutorial video : http://www.youtube.com/v/ztD4kJM4I-w&hl=en_US&fs=1&hd=1