Grimm's Counterrotating Stepped SpiralThe Counterrotating Stepped Spiral is fantastic to use in building up mysterious spiral staircases in a palace or to create a tower with a steep staircase or to make an imaginary place accessible. This set make ideal room decor as it invites everyone to play. By building and playing with these blocks, children develop fine motor skills and spatial thinking skills. 56 building blocks on a wooden plate. Materials: lime wood, non toxic water based color