Package: Set of 30 pack whistles, include 6 colors: red, yellow, blue, pink, purple, green; 5 pieces of each color Package: Set of 30 pack whistles, include 6 colors: red, yellow, blue, pink, purple, green; 5 pieces of each color Colorful Training Whistle: Made of plastic whistle, stretchable coil, key ring, bright colors, it is more likely to catch people's attention in outdoors Stretchable Bracelet Measure: 0.94 in / 2.4 cm key ring, 1.77 in L x 0.63 in W ( 4.5 x 1.6 cm ), 2.36 in / 6 cm stretchable coil, exquisite and compact, can hang on hand, make whistles convenient to carry Loud Voice: Loud and clear sound, can transmit sound over a distance; easy to use, can as a emergency rescue tools in outdoor Widely Application: Suiting for coaches, sports, hiking