Learning Resources Magnetic Algebra Tiles, Algebraic Math Skills, Magnets For Any Magnetic Surface, 72 Piece Set, Ages 11+Learning Resources magnetic algebra tiles make quick work of modeling algebraic principles and creating concrete models. Magnetic write & wipe shapes are excellent for whole class demonstrations or hands on student work. The Learning Resources magnetic algebra tiles set features: 72 magnetic, geometric shapes in a variety of sizes largest piece that measures 12. 5 cm x 12. 5 cm write & wipe surface for your own labels