LED Inline Wheels 64mm 82a Skate Rollerblade Ripstik Light UP 4-Pack w/Bearings No batteries needed, these wheels are powered by centrifugal force. Each wheel includes 3 super bright LED lights that shine for over 10,000 hours Includes a set of 4 64mm Wheels with Fast Abec 9 Bearings. These L.E.D Light up wheels are super easy to install and will fit on most inline skates, casterboards, ripsticks, and even luggage (make sure to check specs first, these are 64mm in diameter with a standard size 24mm width) The Rounded Profile and Super High Rebound Urethane creates less friction allowing for faster speeds and better control Abec 9 bearings offer the highest amount of precision, speed, and durability in replacement bearings. Dont just look cool with light up wheels, Increase your speed with Abec 9 Bearings! These light up wheels not only look awesome, the wheels illuminate the rider at night adding an element of safety to night time riding. Be Safe, Be Seen!!