Age 4+ Explore the inner workings of the human body with our unique paint sheets. Drip paint over the blank sheets and brush or wipe to reveal details of 6 different organ systems, including muscles, bones, nerves, digestion, circulation and respiration. Made from sustainable paper. Check out our instructional video. Includes: 150 sheets/25 booklets, 3" x 7" (9.5 x 18.5 cm).