Suitable from 5 years old, this set features new easy-build parts to ensure a frustration-free creative experience. The new parts a barbell shaped rod that easily sandwiches between 2 connectors, and a flat panel piece that provides structural support were specifically designed to address the needs of younger builders, who can easily build 2 flat shapes and then connect them together into a 3-D creation! Plus, newly designed wheels pop right on theyll be on the go in no time! This set contains 141 parts and easy-to-follow, step-by-step building instructions and ideas for 40 different models. Your little builder can also use the parts to design and create from their own imagination! Everything is packaged in a sturdy suitcase-style box with a handle for easy clean-up and portable storage. Building with KNEX supports a childs developmental growth and puts them on a path towards a better understanding of STEM subjects. As they fit the pieces together, theyre developing spatial awareness and honing their fine motor and dexterity skills.