This tough two-piece tractor-trailer is ready to roll . . . and ready to build! Packed with wooden construction pieces and pre-drilled with holes for the wooden nails and bolts the truck itself is a moving building site. Connect the painted building boards to create brightly colored structures on wheels! The 22 wooden pieces--including a hammer screwdriver wrench board nails nuts and bolts--store away inside the trailer to keep your little builder s supplies organized for the next big job. Big Rig Building Set is great for fine motor skills hand-eye coordination and problem solving and encourages imaginative play and manual dexterity.