Strong aluminium alloy whistle with painted surface goes through an oxidation process to prevent it from chipping and rubbing off. Features with a key ring so that you can hang a whistle on your keys, your backpack or your gear bag and until you need it. Portable, non-deformation, and sound is ringing loud and clear that can help you to confirm the direction, avoid getting lost and find a partner. 1 7/8" L x 1/3" D