Popular Playthings present the Mag Builder - a new and exciting way to build! Mag Builder was designed with the younger child in mind. This 6.5" long one-piece Rolling Base may be used with any Mag Builder construction set. It has real rubber tires and is built tough for active play. It has ten fixed connecting points that offer limitless building possibilities, and its free-wheeling stainless steel axles allow it to travel great distances across the floor with a single push. Include a 6.5" long Rolling Base with 4 rubber wheels and 10 magnetic connect points. So what are you waiting for? Think Big! Think Mag Builder!