1. They roll pretty ,very 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 well on concrete or asphalt. 4. Set of 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 Rebound: 70% Type: Skateboard Parts Board Category: Flat-Plate Model Number: skateboard wheels color:Black+red Material: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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.