6 m+. develops curiosity problem solving. Stack, rock & roll! This Fisher-Price classic has been rockin' kid's world since the '60s. It's fun, it's colorful & it's here to stay! Sort & stack up the fun - from biggest to smallest! Keep the fun growing! Make owl eyes with them. Wear them as bracelets. Balance then on your head. Most loved and trusted by moms (based on a 2015 survey of 1,545 moms in the US, Russia and China). Where development comes into play. Curiosity: As baby stacks all 5 rings bats the wobbly rocker, their curiosity grows! Problem Solving: Taking rings on & off the post helps promote baby's big thinking skills! Are you ready to rock. Colors and decorations may vary. Conform to the safety requirements of ASTM F963. Consumer Assistance: 1-800-432-5437 (USA & Canada). 1300-135-312 (Australia). Service.fisher-price.com. CE listed. Made in Mexico.