This Kit contains an upgraded pair of Chrome air horns, which measure in at a huge 16.75" and 14.5" in length. This horn is louder than any ambulance or fire truck you've ever heard, thats a fact! Just because it is only two horns does not mean that this horn does not get loud. This has been a very popular horn and can be a great starter kit for anybody looking to get into the train horn craze. The way these horns were designed they offer a very easy install. They are relatively flat and can be mounted nearly anywhere. A few very popular spot I've see it mounted is behind the grille of a car or truck grille, along the frame, or I've even seen it fit in the engine compartment on a lot of cars. This kit will also include a 120 PSI air compressor with a 0.5 gallon air tank. Of course, it will include all of the other necessary components as well. A full list of those is listed below.