4 years and up. This set of magnetic marbles brings a whole new twist to traditional marble play! These marbles allow children to build, explore, and create in new ways, offering endless possibilities for hands-on learning and imaginative play. Magnetic marbles offer a fun way to introduce basic scientific concepts related to magnetism, helping young learners understand the forces of attraction and repulsion as they explore. Ideal for individual or group activities where children can engage in building challenges or simple games. Each marble is 0.625"" in diameter. Assorted colors. Set of 20 marble magnets.