Now in green, yellow and red.

We've found a small, super powerful light system that can be retrofitted as a mod into many yo-yos. this tiny light is just about 1-3/8" long and 3/16" in diameter. These are brighter than just about any little light we've seen, much brighter than what comes in light-up yo-yos. The battery is rated for 20 hours, it is not replaceable. To activate, just push on the colored tip of the light, to turn off, flick the tip back up with a fingernail.