Liberty Imports LED Light Up Illuminating Inline Rollerblade Roller Skate Replacement Wheels 76mm - 3 Color LED's (4 Pack) 76mm - 3 Color bright L.E.D. lights molded into wheel sparkle as you move! Self generating power. No batteries required! These wheels are powered by centrifugal force Easy to Install, Maintenance-free, weather-resistant. Will fit on most inline skates, casterboards, ripsticks, and even luggage Includes sealed carbon-steel bearings (ABEC-9). 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! Set of 4 Wheels. 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!!