Play Sprockets Hands-on building set with spinning gears encourages an early interest in engineering and technology Encourages creativity, development, critical thinking and problem solving skills Encourages creativity, development, critical thinking and problem solving skills and helps younger children learn colors, shapes and sizes and improves fine motor skills! 81 piece Motorized Building Set All You Need is 1 'AA' Battery! -(NOT included) Tested for child safety Ages 3+