This toy will quickly become one of your top 10 tools for therapy! Similar in design to a classic erector set but these pieces are colorful plastic. Bigger, easier to handle pieces still provide a real fine motor planning and visual perceptual challenge. Comes with enough pieces and tools to copy the 12 designs in the Tecno manual to make your own creations. Nuts, bolts, girders and brackets all screw into the building platform which is also the top of the carrying case. Two and 3 dimension building is possible. Kids love this toy and have a real sense of mastery and accomplishment when they finish a design. Also works great at home or as a classroom center.