Step lively! Because each brightly colored component could reveal a surprise music (auditory stimulation) or vibration (tactile sensation). A great motivational tool, our Musical Balance Board consists of 10 Red, Blue, Green, or Yellow lock-in-place components (4 modified, 6 blanks) for nearly 10' of fun and learning. Requires 9-volt battery (not-included). SIZE: 6''H x 5 3/4''W x 11 1/2''L (15 x 15 x 29cm).