This high quality hailer horn provides great sound for loud hailer voice, horns, sirens and bells. The horn is made of UV resistant white ABS plastic and stainless steel fasteners. 220SW Features: 30W Hailer Horn, Part Number: 220SW, White ABS Plastic, 4.5"" Diameter, Great Sound Quality, Easy Installation, 4 Ohm Impedance, Compatible With: Standard Horizon Loud Hailers"