TurboSpoke Bicycle Exhaust System Add-On Accessory _ with BONUS MotoCard Refill 3-Pack _ Bundle Turbospoke, the Bicycle Exhaust System that makes your bike look and sound like a real motorcycle!! Fits most bikes with a wheel size of 16 inches and larger; Turbospoke attaches easily in less than 5 minutes. Uses durable plastic Moto sound cards and a megaphone exhaust pipe that let's you really turn up the volume on any bicycle Durable, sturdy construction. For ages 6+, assembly to bicycle required, adult supervision for assembly. Set includes 3 Turbospoke Motocards, acoustic Exhaust Pipe, 15 custom Turbospoke decals, universal fit. Includes EXTRA BONUS 3-Pack of Motocards