This long black bike horn which bears the "Makai" logo is really loud! It not only looks good, but it packs a punch. The horn measures approximately 8.5 inches long, and the end of the horn's opening is approximately 2.5 inches. The horn itself is made from steel with a rubber squeeze ball on the rear-end. The adjustable mount is made from bendable steel and this horn can be adjusted to fit most common size bicycle handlebars.