Fothon Magic LED Light Up Wheels brighten your trail with LED lights that light up as you roll. Poured with Super HR polyurethane to ensure a fast, smooth roll that is durable and long lasting. Great for all types of skating. Includes hardware (sleeve) so that they can be used with either 6mm or 8mm axles. Price is for a 4-Pack (125mm Sold In Singles) Sizes: 84mm Type: Recreational / Urban / Cross-Training Hardness: 82A 8mm Spacers Provided Must Be Used for LED Lights to Work LED Lights average 100 hours light time