The Luminous Magnetic LED Spacers come as a single spacer to replace your magnetic spacers in many light-up wheels as well as of course the Luminous LED Wheels.
Usually, if your wheels are no longer lighting up (working) it just means that the magnet has been overused and that you do not need to replace all of your wheels but rather the magnetic spacer.
They fit in both the Luminous inline and quad wheels with 7mm axles.