This ultimate classroom bundle for STEM education and curriculum support includes four different colorful activity sets designed to engage students through hands-on activities that introduce children to science fundamentals. Featuring simple machines, magnets, sink or float and force and motion activity sets, there's a multitude of learning opportunities! With each activity set coming with it's own easy-to-store storage box, simply stack these sets in your science center for young learners to grab. When you add this to your classroom supplies, students can explore magnetism, engineering, "how things move" through force and motion and "why things float" through buoyancy. Plastic. (4 sets/unit) Storage boxes, 10-1/4" x 13-3/4" x 3".