Let go and break the rules of convential yo-yoing with freehand yo-yoing! Our popular counterweight dice are the preferred counterweight by world, and national yo-yo champions and now they are available in a cool bright blue light up version! To activate the light up feature a button is pressed, and to deactivate press and hold the button for 3 seconds. Disclaimer: Batteries are not replaceable. While this product is very durable, they are not indestructable. Use caution when using over hard surfaces such as concrete.