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 Big Rig Truck Wooden Building Set from Melissa and Doug 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 that store away inside the trailer to keep your little builder's supplies organized for the next big job. Gender: unisex.