4 years & up. Fun ideas come to life with this open-ended set of tools to use for creative cardboard construction. Simply take repurposed everyday cardboard and use the tools to build imaginative and useful creations of all sizes, from a mask to a maze or a flower to a fort. The possibilities are endless. The set includes 325 SCRU reusable pieces in two sizes (100 large SCRUs and 225 regular SCRUs), 10 SCRUDRIVERs, 10 SAFE-SAWs, 15 mini-tools, and a handy storage bag. Adult supervision suggested with children 4 - 5 years old.