Clear LED balls change colors, strengthening visual and tactile discrimination! This ballpool is a great way for adults and children to receive deep pressure sensations and massage. Wooden frame. May be custom-made to your requirements. Suitable for use in a darkened room only. Requires approximately 2,000 clear-colored balls sold separately (see #W8533). Measures 4'9" square x 28 1/2"D. Walls are approximately 7 9/10" thick.