With the Giant Magnetic Building Set, 100 pieces, children can get creative using magnetism. The set includes large and small rods, curved rods, and balls made of ABS plastic and metal for a variety of constructions. The invisible attraction and repulsion of the magnets is a fascinating phenomenon for children. With this set, kids can build imaginative structures in both 2D and 3D. The Magnetic Building Set comes in a handy transparent plastic box with a clip lid for storage. Contents: 48 small rods (7.2 x 2.4 cm), 18 large rods (11.9 x 2.4 cm), 8 curved rods (9.7 x 2.4 cm), 26 balls (diameter: 4.5 cm), 1 instruction booklet, 1 storage box (34 x 24 x 21 cm).