GLOW IN THE DARK CONSTRUCTION SET - Build endless playhouse structures, tunnels, and more with this construction set containing 64 glow-in-the-dark connectors and 36 multi-link balls. BUILD YOUR OWN FORT - Create a giant kids' fort by inserting and rotating the rods into the balls (adult supervision recommended); can be played indoors and outdoors. The glow-in-the-dark function requires exposure to light before it activates in the dark. LEARNING TOYS FOR CHILDREN - Build and imagine while mastering basic engineering skills; this construction set is designed to spark creativity; create a child's playhouse by adding a light cover for the roof. INSPIRE CHILDREN'S ABILITY - To cultivate children's imagination, develop hand-eye coordination, train fine motor skills and improve color and shape recognition. CONSTRUCTION TOYS SPECIFICATIONS - The children's construction set is made of child-safe, BPA-free plastic; includes 12.2-inch rods and 1.38-inch balls; these construction sets are suitable for curious children aged 4 and up. Type: Construction Set Material: Plastic Color: Package Contents: 36 x Ball 64 x Rod 1 x Tent Cover Only the above package contents are included; other products are not part of the set. Note: Photography and different screens may cause the object's color on the image to differ slightly from the actual. The allowed measurement tolerance is +/- 1-3 cm.