The Butterfly Life Cycle Spinner is a simple paper spinner with an inner and outer paper disc and a rivet in the center for the paper to spin around. As the paper is turned you select from six butterfly life cycles: Adult, Eggs, Larva, Caterpillar, Pupa, Emerging. The image in the window shows you what the life cycle looks like and how many days during the metamorphosis. This product is sold at your local Dollar Tree retail store for $1. Because the inventory at those stores is hit-or-miss I decided to buy them up when they are in stock so you can find one when you need it.