Kids like to use these tunnels to explore and pretend, but the tunnels can also be connected to any of the four standard size Pacific Play Tents available. The center of the tunnels has a mesh top so kids can see out. It folds conveniently and compactly in only seconds and sets up just as easily. The tunnels of fun set includes four 3'long x 18 in diameter tunnels and a junction that measures 18.5 high x 35.5 in diameter. It is made of 70 D nylon Taffeta that meets all safety standards. A nylon storage bag is included.Ages 3 - 7.By Pacific Play Tents