Set of 3 ACME Effect Whistles : Tugboat + Slide + Siren SET OF THREE ACME EFFECT WHISTLES MADE IN UK. ACME TUG BOAT WHISTLE : Makes the true steam whistle sound !!! ACME SLIDE WHISTLE : Sometimes called the Song Whistle, this is the professional concert model. Dimension: 11.75" (30cm long). ACME SIREN WHISTLE : A wonderful sound effect. Useful and unusual warning signal for small boats and general use.