The building set cornerstones opens new possibilities with ball runs. As the marbles, small balls and balls hit the cornerstones they change direction.
It allows tricky and surprising layering variations and develops spatial thinking. In combination with Grimm's classic building materials, the Cornerstones reveal their true greatness. With their aid, the most diverse marble runs arise.
18 pieces in wooden frame
Size: 15 x 15 x 5 cm.
Made from Beech wood, non-toxic water based colour stain.
Recommended for children ages 3+ years.