These Glow in the Dark 72mm LED light-up inline skate wheels from Luminous, use glow-in-the-dark urethane and embedded LED lights to light up as you skate. As the wheels rotate they glow and light up brightly! These are great for night skating and rink skating to add some fun to your ride. The light is generated by a magnetic strip around the inner hub of the wheel and bearing spacer. These wheels are not suitable for a lot of jumping. These are recreational skating wheels. Features Include; Wheel diameter 72mm Durometer / Hardness 85a The price is for 4 wheels Please note, Luminous wheels are NOT a novelty wheel, Luminous uses premium urethane and LED globes to ensure you don't sacrifice your skating experience. A coloured tyre that also glows in the dark even when you stop skating!