You will receive 4 wheels already assembled including bearings and spacers
58 mm diameter (tall) and the 82a is Soft wheel good for rough surfaces
Bearing steel is pre-lubricated and compared to others, the lubricated bearing steel is much better in speed and durability
They are more for cruising wheels, they are too tall and too wide for smaller boards and tricks
They are smooth riding wheels and inexpensive but great quality
The wheels are easy to install, just simply place the wheels on the axle like regular wheels.