Acme\'s Model 558 Black Plastic Thunderer Whistle is made from tough and bite resistant polycarbonate, giving it a longer life than standard plastics. Classic big size with a deep and loud reverberating sound. Available in two tones, the High tone is suitable for anyone who is short of breath whereas the Deep tone is tough and bite resistant making it a long-lasting whistle.Thunderer whistle FeaturesClassic dog training whistleAvailable in deep and high tonesTough polycarbonate plasticMade in EnglandAcme\'s Ref.MPN: ACTPH, ACTPDColour: BlackSizes: High Tone, Deep TonePM Ref: 700275