The Build 15 Model Set is ideal for both beginners and intermediate users - Features: 84 pieces. 385 connecting points - It contains enough parts to build fairly large functional models and some amazing contraptions. The Engino Toy System is perhaps the most advanced and versatile three dimensional construction toy in the market today. It offers both children and adults unique opportunities for design and creation. The system is comprised of multi-faceted rods and connectors that share unique geometrical features that allow connectivity on up to 6 sides simultaneously. In essence, the patent pending design transforms rods into connectors and allows dense or open construction. This allows engineers to build simple or complex models quickly with a smaller number of different components. In each set many different models can be created from a wide range of themes, from structures to cars, planes and cranes. Detailed instructions are included for the major models while additional models can be assembled by following the plans free to download instructions online at the Engino website.. All sets can be combined together to create bigger builds, limited only by the child's imagination.