Whistle with Colorful Stretchy Bracelets: The whistles is about 6.3cm in length, 2.8cm in width, and 3.2cm in height. High Quality Material: The training whistle is made of plastic whistle and nylon lanyard, sturdy and durable, safe and odorless, the durable lanyard coil is lightweight and soft, can be comfortably worn on the neck.