One of the neatest ideas I have seen. Works perfect on the kids bike tires and super easy to install. I received this product through tomoson for review purposes. It comes in a package with several choices in colors like blue, white and red and simply twist on the valve stems. These little gadgets last for a long time and make it easy to see the kids in the dark. You can pick up a set on amazon at the following link for a decent price.