Acme 451 7'' orchestral siren hornIntroducing the Acme 451 7" orchestral siren horn The Acme orchestral siren was originally a cyclists road clearer in the 1880s but now has a variety of applications, including use in professional orchestras. This high quality horn projects with an unmistakable sound and would make a great addition to any percussionists kit bag. Crafted with precision and care, the orchestral siren is a reliable instrument which still proves popular today. With a 7