Package includes 7 different colors whistles,each color has 3 pieces,21 pieces total.
7 bright colors:red,yellow,green,blue.purple,black,silver,can meet your different color preference.
Loud sound can be heard even far away
Portable and convenient with a key ring to deal with emergent situation.
Not only suitable for emergency situation in sporting events, such us camping, hiking, boating but can be a gift for little children.