Panelcraft Rainbow Solids!- 19 Piece Set includes 11 solid panels, 23cm x 23cm (9"x9"), and 8 white windows 23cm x 23cm. All pieces are magnetic. Panelcraft is the world's first and only large scale magnetic construction toy. It was designed by teachers to inspire spatial developments and creativity in children. Their large size allows construction of toy furniture and play houses and can be used with existing toys giving them extended value. Surfaces are dry erase compatible. Grades PreK+.