​​Sensory building set for toddlers ages 1-3 with 30 big building blocks and special pieces ​Includes 8 sensory features to discover and develop tactile, visual and auditory skills ​Toddlers can build the caterpillar train and its cute critters, then pull its string to get groovin' ​Blocks are compatible with all MEGA BLOKS building toys for endless learning fun ​Endorsed by Fisher-Price, this learning toy helps develop fine motor skills, creativity and imagination Little builders will move and groove alongside this adorable caterpillar train. Toddlers can build a caterpillar train with motion and chain blocks, and a pull string in the front to get it rolling. Then, they can add a ladybug with a pop block, snail with a turn and click feature, and a butterfly with textured wings on the caterpillar's back to come along for the ride. Toddlers can also discover a mirror flower, textured antennas, and a bee bead block.