This whistle is made from durable plastic and makes a great safety whistle, perfect for lifeguards, swimming pools and waterfronts. The whistle has a non-degradable cork pea to give it a piercing trill that cannot be ignored! The harder you blow, the louder the sound. Will be heard above ambient noise, loud crowds, the roar of engines, breaking waves and thundering gale-force winds. Pair with Theraquatics lanyard for hands-free use.