The 100 blocks of this building set with lengths ranging from 4 - 20 cm are ideal for so many creations. You can build up walls, towers, houses with furniture, castles and so much more. They can also be used to build unique marble runs for example with Building Set Cornerstone (Art. No 10184). This set make ideal room decoration as it invites everyone to play and is a wonderful complement to all Grimm's building sets. By building and playing with these blocks, children develop fine motor skills and spatial thinking skills. 100 building blocks in a wooden frame. Materials: lime wood, non-toxic water based color stain/non-toxic plant based oil finish.Size: frame 44,5cm, single blocks 4cm thickness, length up to 20cm.