18 months & up. Little ones will be fascinated by these real specimens embedded in easy-to-hold viewers. Teach early biology with four different specimens to view within the views: a green chafer beetle, a yellow butterfly, orange larkspur flower, and a bean sprout. The magnifying-shaped item that holds the specimens are made of lightweight, unbreakable acrylic. Viewers measure 3.5"W x 6.5"L x .875"D.