Mega Bloks First Builders Move 'n Groove Discoveries Caterpillar Building Set Musical pull-along caterpillar with building bases that appear as you roll! Includes buildable bumblebee and seven First Builders blocks in new colors and printed patterns On/Off switch for sounds Perfect for little hands Compatible with all First Builders sets Happy little critter comes with 7 First Builders blocks in new colors and printed patterns, as well as a buildable bumblebee that can stack on the caterpillar's back for building on the go! On/off switch Compatible with all First Builders sets Perfect for little hands