Brand new speakers. Air Horn is suitable for marine air horns, with stainless steel gas tanks, and the horn is suitable for any 12v/24v truck, boat, car, motorcycle, truck ect Two tuners Maximum 180db, super loud. Including installation hardware. Easy to install. Requires air system. specification: Material: high-quality chrome-plated ZINC horn (no rust) Voltage: 12V 24V Luminosity: 1800db± length: Long horns: two 28 cm Product weight (kg): 1. 98kg Package weight (kg): 2. 1kg Make sure the horns angled just a bit down so no will build up in the horns. The maximum decibel of the product is 180db. If you want other metal air horn, please search our store on Amazon.