Acme Whistle Thunderer, Big size, Solid Brass, Silvery Finish, Pea Whistle, Tapered Mouthpiece, a medium sound recommended for: General Signalling & Police, Blowrate: Modest, Blowsound: Medium Loudness, Blowtone: Midtone, Dimensions: 5.5(L) x 1.9(W) x 2.5(H) cms,