GGS 2 Pcs 12V Univeral Electric Loud Snail Horn for Motorcycle Motorbike Auto Car Vehicles Compatible For : All vehicles of 12V, like motorcycles, cars, and vans etc Can be adjusted to the sound of ordinary sail shaped horn Single horn diameter about 10cm, the diameter of the thickest part about 8cm Material: Plastic + Metal Note: Please make sure correct wiring, for wrong wiring may lead to failure sound of change and echo effect