Exciting and challenging balancing system. The elements can be combined in countless ways so use your imagination to set up all the balance courses and landscapes you can build. With the great flexibility of Build N' Balance®, the level of difficulty can be varied to suit the development levels of the children and can be built at heights ranging from 10 to 24 cm - depending on how brave the children are. Build N' Balance® is being constantly evaluated and developed, introducing new parts and features to offer even more challenging play opportunities. This Rocking Plank add-on is an element with an integrated rocking function, requiring the children to transfer their weight as they move from top to top (not included). The Rocking Plank moves 2.36" as it rocks. Measures 28.35" x 5.12" x 4.33" . Weight Capacity: 110.25lb.