5Core 24" Wide PA Trumpet Horn Outdoor Long Throw Aluminum Bell Easy Install. Approximate measurements of the horn at the small end. Inner diameter 4-3/8" Outer diameter 5-3/8" Compact, user-friendly Trumpet Horn formed of heavy-duty aluminum material delivering high-quality clean and intelligible sound output within a wide range of area. The well-manufactured Trumpet Horn. Very nice, pre owned condition. No damage. Please see photos for more details on items overall condition.