100% non-magnetic quality stainless steel trumpet with a bright polished that does not rust The trumpet is mounted side by side for easy installation Designed for outdoor use in almost any weather condition, including fresh or salt water Does not require a compressor or hoses, saving time and money Exterior roof mounting on for RV trucks and boats perfect for any 12 volt electrical system Colour:Silver Material:304 stainless steel Size:103mm Package Contents: 1 * Marine Dual Trumpet Horn Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.