3Bears Emergency Survival Aluminum Whistle Key Chain for Hiking Camping Climbing(Large and Small Sizes, Red,Yellow,Blue,Green,Purple,Silver, Pack of 6 or 12) Material&Color: Aluminum; Red Yellow Blue Green Purple Silver Length: Large 6.4cm/2.5inch; Small 4.6cm/1.8inch Portable and convenient with a key ring Loud whistle (large one sounds loud & small one sounds sharp); Great for sporting events, camping & hiking,boating Package Include: 6pcs or 12pcs of 6 colors large whistle and 6 colors small whistle