... -High strength and hardness, compound hub; 3-100x24mm. Alloy core scooter wheels:1-CNC machined alloy 6061 /T6, High strength and hardness ... Razor, Madd gear, JD Bug, etc ;3-High rebound Urethane PU wheel;4-Dimension: 100x24mm;5-Hardness: 85A-88A;6-Weight ... time,we will reply you asap.Thank you! Alloy core scooter wheels