High Octave Voice: The bird whistle is a magical little whistle that goes in the roof of your mouth that changes your voice to a high octave and lets you make awesome sound effects. Smooth and Safe: No edges, very safe for kids, with a smooth and thickened paper construction. The bird call whistle is waterproof, environmentally friendly, and . Applicable Occasions: The slide whistle is suitable for many occasions, such as birthday parties, theme parties, graduation parties, housewarming parties, and more. Simple to Use: Rest on the tongue, with the half moon shape of film pointed outwards. Let the whistle get moist in the mouth. Once moist and pliable, push it to the roof of your mouth with your tongue and say the words for Kids: Suitable to use , in the classroom, , on family day, or on party games. It's an Christmas stocking stuffer and Easter basket filler. Colour:As Shown Material:Metal Package Contents: 10 * Bird 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.