Panelcraft Earth Color Solids-19 Piece Magnetic Set includes 11 solid panels in sky blue, sage, sand , brown and gray and 8 White windows panels 9" square. Endless building possibilities for future architects and engineers. Develops both fine and gross motor skills, patterning, shape recognition, and balance skills. Surfaces are dry-erase compatible. For the complete STEM experience add Mirror Inserts #180081 or Heat Sheets #180082 to this set to expand play.