1. They roll pretty , durable for street skating and extremely on skate park terrain. 2. Wheel size: 70mm diameter x 42mm width; Durometer count: 83A Polyurethane wheels. 3. These wheels are perfect for drifting,penny board,long board. They are great for cruising and many early street tricks.They can also do on concrete or asphalt. 4. 4 wheels. Fine workmanship and beautiful appearance. 5. Polyurethane wheel and pp hub make the wheel more durable and wearable. Name: Super elastic skateboard wheel Model: LZ7042-1 Hardness: HR83A : 70% Type: Skateboard Parts Board Category: Flat-Plate Model Number: skateboard wheels color:Black+red :Polyurethane+PP size:70 x 42mm Package Contents: 4 x Skateboard wheel Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.