the sports whistle with good sonority, crisp and loud, doesn't use a pea as the core, which can be blown easily, and its volume and pitch can be controlled; In addition, the whistle can be applied in many occasions to attract others' attention portable with saving space Versatile uses: the whistle requires simple manual operation and is fully controllable at any time, even during training and games, so you are not out of breath. It can also be used as portable outdoor sports whistle, dog trainer etc. and easy to clean, so you can use it with confidence. the hand whistle is particularly hygienic, as it does not have to come into contact with the mouth and you do not have to worry about infectious , it can be used by many people. Color: red+blue Material: PVC+PP Package Contents: 6 x whistle Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.