Whistles are made out of a strong aluminium alloy, and the painted surface goes through an oxidation process to prevent it from chipping and rubbing off.These whistles are extremely loud and will rival any expensive emergency whistles on the market. This is a great giveaway for emergency protocol seminars, conferences, trade shows, and other promotional events about safety.PMS available for product color and imprint. Overseas production. Lower quantity available. Includes ocean freight which are delivered to NY.