32 Colors / 64 Crayon Rocks / 2 of each color Our Just Rocks in a Box was designed for classroom use. Intended for classrooms of 24 children, this box typically lasts an entire year even with frequent use. For upper elementary grades ages 9-12 we have included the our basic spring and summer 16 colors and added 16 colors more that capture a wide variety of tones including those that we call People Pebbles for skin, hair and eye colors. There are 2 of each color, making up a box of 64 crayons. Designed to strengthen the tripod grip muscles in young children and improve motor coordination, in older children they enrich the creative experience of art. The perfect addition to your art center and give older grades a rich pallet of colors to use with their art work.