TPTKSW05 Tops Survival WhistleThis is a set of five hardened plastic survival whistles, each measuring 2 3 4" x 1", designed for signaling in emergency or outdoor situations. The heavy duty black plastic construction is built to withstand harsh conditions, and each whistle produces a loud, piercing blast effective for attracting attention over distance. Ideal for hikers, outdoor enthusiasts, or as bulk emergency kit components for group expeditions or organizational preparedness.