Gear up for hands-on science and engineering lesson plans! Young learners will love building their own gear systems on any magnetic surface with these bright Spinning Gear Magnets. Perfect for your classroom’s whiteboard, these vibrant gears have a spinning feature that allows them to interlock with other pieces and get things in motion! Each with a bright sticker design in the center. Plastic. (22 pcs. per unit) 2 1/2" - 4"