Acme Thunderer Whistle is an easy to use whistle that needs little breath in order to make a sharp, shrill noise. Recommended to those who are short of breath, the Thunderer safety whistle can be used by both young & elderly as well as a referee whistle. Choose from either a powerful, reliable plastic whistle that is tough, bite resistant and will make a high or deep tone. Thunderer Plastic - High tone or Deep tone available. Made from a tough, bite resistant polycarbonate plastic material that boasts a longer life than standard plastics All whistles have a ring attached so you can safely attach them to a lanyard Colour: Nickel, Deep Tone Plastic, High Tone Plastic