The Roller is a beautiful new conceptualization of a fundamentally challenging motor activity object. Leave it out, and you will see both children and grown-ups tempted to test their skills by stepping up and trying to set the Roller in motion. It offers a progressive motor skills challenge, from small kids just managing to keep their balance with the support of a friend or a hand rail, to older children pushing the boundaries of what they can do without falling off. Whether it is used for play or in therapy, the Roller will stimulate the primary proprioceptive sense, as well as the vestibular and tactile senses. The Roller is safe to use, as the compression of its rubber tires naturally reduces the speed while making play virtually silent and protecting the ground surface from damage. The rubber tread provides a safe grip and offers additional tactile stimulation when rolling with bare feet. For younger children, this green version of the Roller contains 5.5 lb of sand, further reducing the speed and enabling even small children to master balancing and rolling. Includes:Stimulates the primary proprioceptive sense, as well as the vestibular and tactile sensesOffers a progressive motor skills challengeContains sand to reduce speedAges 4 and upSpecifications Width: 14.5 Height: 14.5 Depth: 14.5 Measures: 13.78" x 15.55" x 11.61" Weight: 6 lbs