Light up the night with this awesome set of 4 76mm LED inline caster wheels! each wheel includes 3 super bright LED lights that shine for over 10,000 hours! no batteries needed, these are powered by centrifugal force. The faster you go the brighter they get! speaking of going fast, these wheels come with ABEC 9 bearings! the clear urethane transmits and magnifies the LED lights, coming in at 82a, these wheels ride fast, smooth and bright.