Discover the magic of launching and guiding a loop of string through the sky. It's all about how you move that makes it move too! Learn about tension, gravity, lift, and drag to make the string perform incredible tricks in the air. Fun for all ages! Includes: 1 ZipString, 3 Strings of different lengths for a range of difficulty. Compact to easily take with you on the go and USB rechargeable design. Unlimited tricks - be creative and master the moves you want to!