These party favor toys have a dual function. They magnify and make a whistling noise. The magnifying glass is approximately 2x magnification while the whistle makes a high pitch shrill sound. Made of hard plastic. Comes in assorted colors. Size 3¾" diam. Get a clearer view with a seeing eye toy. Perfect party favor toys for any party. With a wide selection of different viewing toys you'll be sure and find exactly what you need for your party.