This fascinating kinetic sculpture swings around in perpetual motion on your desktop. The large exterior circle moves back and forth while the three dolphins rotate within the interior, all powered by magnetic motion. A wonderful conversation starter in your home or office. Outer circle measures 5-1/4" in diameter. Stands 7" tall on a 4-1/4" diameter base. Made of metal and plastic. Requires 4 AA batteries, not included. Ages 6+.