Encourage discovery, experimentation, and creative play with these brightly colored, 5/8"-diameter magnetic marbles. Set of 50. For over 50 years, hand2mind has encouraged hands-on learning and discovery, driving deeper understanding and helping children unlock their full potential. Hand2mind specializes in science kits and stem toys designed to help students learn by doing. Our offering of stem kits range from chemistry sets to rocket science kits to earth science sets and much more. From early science toys to middle school lab supplies, hand2mind has you covered with products designed to enhance learning in the classroom and the world around us. Through hands-on exploration and discovery we strive to find new ways to encourage students in math practice, literacy activities, STEM education and more!