Explore, Compare, and compose shapes with these Ancient puzzles. Soft, colorful foam is durable and easy to grasp. Magnet tangrams are a fun way for children to develop important math and visual skills: geometric and spatial reasoning, problem solving, and art/design! encourage children to create their own patterns and pictures using the seven geometrical Tangram magnet shapes on the refrigerator or on magnetic lap boards/whiteboards (sold separately). includes 56 magnetic pieces (8 sets of tangrams in 4 colors) in a handy bucket. Measure .22 inch thick each. Made of soft foam and flexible magnet sheet. No slipping-backk side of each shape features a solid piece of flexible magnet. Storage: store in bucket and away from high heat and direct sunlight. Child safety tested for ages 3+/grades prek+.