Features: Quality Materials: This double tube whistle is make from plastic materials, can being used for long timing. Loud Whistle: This highly frequency is loud, and that transmission distance is long, very useful for various emergencies situation. Easy to Use and Carry: This small whistle is small and lightly weight, can being hangings on the keyring as ornaments. Multiple-purpose: Emergencies tool safety whistle for variety of occasion, such us camping, hikings, hunting. Wide Application: Suitable for adventurers, sports enthusiasts, and trainer, our whistle is a multifunctional tool for signaling and communication. Specifications: Materials: Plastic Package Weight: about.28g Color Optional: 3 Color is Available as Show in the Picture. Size: about.7.2cm/2.83in Package Includes: 2Pcs Lifesaving Whistle note: Please allow 1-3mm error due to manual measurement. Please make sures you not mind before your bid. Due to the differences between different monitors, the picture may not reflect the actual colorful of the item. Thanks!