Not your usual ball run, the Rollipop hasspecially engineered balls that drop oh-so-slowly, allowing toddlers to visually track them as they drop or even pick one up as it rolls to start all over again. Balls roll, plunge, and spin before plopping down into the base. This advanced set includes five balls and plenty of pieces for different configurations. Builds coordination; teaches cause and effect. 20L x 11W x 19H. Ages 9 months and up.