The Grimm’s Counterrotating Stepped Spiral is great to build up mysterious spiral staircases, to add majestic staircases to palasts, to make castles accessible and much more. 56 building blocks on a wooden plate. Materials: lime wood, non-toxic water based color stain/non-toxic plant based oil finish. Size: height and diameter 30cm, single blocks 4cm thickness, length up to 15 cm.