Vroom! Vroom! Turn your bicycle into a MEAN MACHINE with this Turbospoke. Ever put cards in the spokes of your bike as a kid? The Turbospoke does one better…it uses specially designed, replaceable cards that flick in the spokes of the bike. The sound is channeled through a chrome acoustic chamber to create a GROWL people will notice. Set includes: Acoustic exhaust cylinder; Turbospoke custom decals; 3 replaceable Turbospoke cards.