Limber Line and Circle O help children learn six special letters in English - a, e, i, o, u, and y. They will use at least one of these letters in every word they write later on. With large printed words written vertically and smaller ones written horizontally underneath the larger ones, children also get a sense of where these letters fit into words. Simple rhymes make the story move along fast in a fun way. We hope you'll enjoy getting to know our adventuresome friends, Limber Line and Circle O !