TheHABA River Rocks Balance Board is a variable system consisting of stepping rocks and boards, which can be used for different age groups. Four round stepping surfaces supported on rubber ball elements that make the rocks tip sideways or diagonally that make it a challenge to cross. Touch and feel with your feet. Rubber ball elements in the corners on the base also tilt bridge sideways or diagonally adding to the degree of difficulty. Constructionis so easy that children can even do it themselves. The boards can also be used with Balancing Blocks:112000or111813.Simply hang them into rungs of the block platforms and you have a whole new level of obstacles with different tactile experiences.Boards are made of birch wood – Length: 7′ x 6″W x 1″thick, topped with four round wooden rock-like surfaces supported on rubber elements. The rubber ball feet in each corner of the base – 1″diameter, are slip resistant, won’t damage floors and are safe for hanging. Can be used indoors or outdoors. Weight Capacity: 243 lbs for 7′. For ages up to 12 years. Balance at different heights Non-slip, floor-friendly & secure Touch and feel with your feet For indoor or outdoor use Use lying on ground or hooked into balance stands 7’L x 4″W. Ten yr warranty. Made in Germany. *** HABA is custom produced, no cancelationsor modifications allowed.Lead time is 12-14 weeks.