Set of 4 wheels.There comes with ABEC-9 high steel bearings and spacers, which have been installed on wheels They roll pretty smooth,very for street skating and extremely skate park terrain These wheels are perfect for penny board.They are great for cruising and many early street tricks.They can also do well on smooth concrete or asphalt. There is delicate packaging, it is better for gift 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. Colour:Black Material:PU and Metal Size:60x45mm Package Contents: 4 x Black Wheel 8 x Black Bearing ABEC-9 4 x Sleeve Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.