Build, roll, and watch it tumble! The Stack n Roll Tumbling Tower Stacking Toy by Kidoozie is a unique construction kit and activity set all in one. This toddlers stacking toy set from Educational Toys Planet features 6 easy to stack translucent cups that form a tower over 2 feet tall. Once you've built your towering masterpiece, roll the 2 colorful balls into the top of the tower, and watch them tumble all the way to the bottom! The Stack n Roll Tumbling Tower Stacking Toy includes 10 vibrant pieces in all and is the perfect toy for all young children. All pieces are made of easy-to-clean lightweight plastic. This fun toddler activity set is great for developing physical skills, balance, and problem solving skills. Let's start building!