These Luminous Wheels are the harder wheels, perfect for roller dancing or skate park. The Luminous Roller Skate Wheels are a perfect combination between the latest LED technology and a top quality, high performance polyurethane. With Luminous wheels, skating at night is more fun and safer for everyone. Thanks to the high visibility, people can spot you from far away and look at you with a huge smile on their face watching the bright colors under your feet as you skate. Sold in a pack with 4 wheels (one skate). 4x 8mm magnetic spacers included. You must instal bearings.