The Moving, Mind-Building Modeling System! ZOOB pieces snap, click and pop together 20 different ways, so there’s no limit to what kids can build! And because ZOOB pieces can move, kids can play with their creations instead of just looking at them. The pieces come in a resealable storage bin. ZOOB Junior 55—for ages 3–6—includes larger pieces for smaller hands and includes instructions for 24 creations. (NOTE: The regular sets are ages 6 & up.)