It includes over 440 micro and classic scale KNEX rods and connectors to build anything you can imagine. The enclosed step-by-step colour-coded instructions get the builder started with 35 different unique builds. Builds vary in difficulty so you can build a robot, owl, space shuttle and more; And when the builder is done, all the KNEX rods and connectors can be stored in the reusable treasure chest style packaging. Most models can be built one at a time. Set is a mix of micro and classic scale KNEX pieces. D30.48cm. For ages 7 years and over. WARNING(S): Not suitable for children under 3 years old. Only for domestic use. To be used under the direct supervision of an adult.