Adopts good quality materials, sturdy, waterproof, lightweight and durable for years of use.
No battery required, 100% manual power oriented, energy- saving and economic.
The card can work with spoke to create exhaust sounds, and the sounds would be amplified by the pipe to make your bike sound like a real motorbike.
With 6 sound making cards, adding much more fun to your cycling.
Suitable for 16-22 inch bikes, easy to install and use.