【Specifications】Whistle size: 5.5cm * 1.5cm * 0.8cm 【Material & Design】Made of 6063 aluminum alloy, it has excellent durability. It features a key ring, making it stylish to carry as a keychain. 【High Volume】The maximum decibel level is 120 dB, producing a high-pitched sound even with a light blow. 【Applicable】Suitable for field trips, mountain climbing, camping, fishing, hiking, travel, training dogs, keychains, and other outdoor activities. 【Set Contents】4 x Gold whistles, 4 x Silver whistles