1. Not only does the appearance look like a real motorcycle exhaust pipe, what's great is that when you start riding, the sound from the exhaust pipe is very similar to that of a real motorcycle 2. The power comes from your pedals, and the sound is produced by a special material sheet continuously rubbing your bicycle spokes. Each set of Turbospoke is equipped with three sound effects cards, namely T500, T250, T100, and they are tuned through one Mechanism, each piece can produce two kinds of sound effects, there can be a total of six interesting motorcycle sound effects 3. Can fit 95% of bicycles, from 16-inch small wheels to 22-inch full-size bicycles, can be easily installed and used 4. After the sound is produced, it is amplified through the exhaust pipe, and when stepping on it fast, it can be as great as the sound of a real motorcycle! Specifications: 1. Exhaust pipes with real proportion metal texture painting, six real wild motorcycle sound effects 2. Suitable for 95% bicycles (BMX, mountain bike, racing car), 100% body power without electricity 3. Includes a full set of assembly tools, quick installation in five minutes 4. Three tunable Motocard cards, turn any of your bicycles into a motorcycle! Package Included: 1*Sound exhaust turbine