Features:Smooth riding， with the good quality PU wheels.Magnetic force to light up， no need batteries.Standard cruiser wheel size， 60mm X 45mm， fit to most Skateboard.Specifications:Material: PU， HRColor: Red， Blue， White， GreenSize: 60mm X 45 mmNOTE: For different monitors， the color may vary slightly. Besides， please allow some errors of manual measurement， thank you for your understanding!Package Includes:4 X Lighten Skateboard Wheels4 X Black Rings