It"s HUGE! This model bridge is more than five feet long, six inches wide and sixteen inches tall. It was designed to carry two lanes of HO-scale model trains (or one line of O-scale train), or use the road-bed graphic for matchbox cars and trucks. Manufactured in the USA from top-quality domestic solid oak and non-toxic formaldehyde-free plywood, the kit includes everything you need to make this wonderful addition to your model train or slot-car layout, or as a display model for civil and architectural engineering groups and anyone else with an interest in bridges. The only tools you"ll need are scissors, sandpaper (optional), some wood glue and about two or three hours of your time. It"s a better use of your time than most evenings of TV watching, and you"ll have a really cool bridge to show off for it too! The detailed instructions are filled with photos and tips to make construction as simple and easy as possible, however we recommend that an adult help any kids under 12 to assemble this kit. Cable-stayed bridges are typically considered the most elegant of all the bridge types, and they"re not only pretty, they"re smart too. The instructions for this kit includes a section on the physics of cable-stayed bridges, and an analysis of the vector load calculations required for structures of this type. It"s a great introduction to the science of statics (the physics of static structures) and civil engineering, and its a fun project to build too! * Train set and toy cars are not included with bridge kit. Shown for scale comparison only.