Make your bike look and sound like a MOTORBIKE! You know how kids used to put a baseball card in their bike spokes? This is like that, but waaaay better! It installs in less than 5 minutes on just about every kids bike, comes with 3 different sounding "motocards", and has radical stickers to customize it. The motocards are durable, long-lasting, and waterproof. Turbospoke is built tough and designed to stay in place no matter how rough you ride. Best of all - it runs on pedal power - no batteries! TheNewToy HIGHLY recommends Turbospoke for all kids ages 6+. And remember - the FASTER you go, the LOUDER it gets!