Pen control is an essential skill which children need to master before they can learn to write. This wipe-clean book provide plenty of opportunities to practice this and their counting skills, as children move the special pen from one dot to the next to reveal a variety of vehicles. Pen control is an essential skill which children need to master before they can learn to write. This wipe-clean book provide plenty of opportunities to practice this and their counting skills, as children move the special pen from one dot to the next to reveal a variety of vehicles.