GLOW-IN-THE-DARK FORT BUILDING KIT - Build endless play tent structures, forts, play tunnels and more with this building fort set that includes 64 glow-in-the-dark connecting rods, 36 multilink spheres BUILD YOUR OWN FORT - Create a giant kids fort by inserting and twisting the rods into the spheres (adult supervision is advised); Children can play indoors and outdoors. The glow-in-the-dark feature needs to be exposed to light before it activates in the dark. LEARNING TOYS FOR KIDS - Build and imagine while mastering basic engineering skills; this construction fort construction kit designed to spark creativity; make a children's play tent by adding a light sheet for the roof. INSPIRE KIDS ABILITY - Ideal for cultivating children's imagination, developing hand-eye coordination, training fine motor skills as well as improving color and shape recognition. the kids playset is made with BPA-free, child-safe plastic; includes 12.2 inch rods and 1.38 inch balls; These construction fort building toys are perfect for curious-minded kids ages 4 and up. different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.