Keep any stability ball in place with this sturdy Balance Ball Ring from Gaiam. Made from durable plastic, this raised ring is sturdy yet lightweight, and can be easily assembled with no tools required. The ring features four slots that allow for the addition of exercise tubing, turning this base into a stable chair and workout bench. This ring is also great for keeping your stability ball from rolling away when not in use. The Balance Ball Ring is made from PVC and measures 20" wide and 2" tall and is compatible with ball sizes 55cm, 65cm, and 75cm. Easily disassemble for storage.