Gressco | The stool staircase offers lots of options to playfully train balance and equilibrium. Children can walk on the stools like steps, crawl underneath them like a tunnel, or use individual stools as platforms. When pulled out, the stool staircase is approximately 8 1/2 ft long, but can be pushed together to save space. Made of birch wood, tread surface made of non-slip surface. Rubber stoppers on the contact points stop the stools from slipping.