This QUADRO Advanced Construction Kit is a building set and a play system all in one rugged, 186-piece kit. With varying length tubes and 1-, 2-, 3-, 4-, and 5-way connectors, the design possibilities are limited only to your imagination, especially with so many extension kits and add-on pieces available. All QUADRO components are fully compatible with each other and this unique play system can grow with your child as you add components. QUADRO modular play systems are easy to build, easy to extend, and are rugged enough for the outdoors in the summer and the winter because they are made from fade-resistant thermoplastics. And, they can easily be re-built in the house in the winter which means active play options for kids even when the wind is howling and the snow is blowing!