Dowling Magnets DO-736710 Solid-Colored Magnet Marbles, Set of 400

They look like ordinary marbles, but they're magnets too! Build pyramids and other fun shapes, play marble games and more. Each marble is 5/8" in diameter. Engage in magnet play, build pyramids, count, sort, and more! Bold, assorted colors. For ages 4+, grades PreK+. Each pack includes 400 marbles in a display box.