This LEGO MINDSTORMS Robot Inventor set (51515) is a fantastic addition to any young robot enthusiast's collection. With 949 pieces, this complete set allows kids aged 9-11 to build their own unique robots and explore the wonders of robotics. The set includes everything needed to get started, including a colorful assortment of LEGO pieces, a motor, and a remote control.This LEGO set is perfect for kids who love to build and experiment with robotics. With the Robot Inventor set, they can create their own custom robots and experience the thrill of discovery. Whether they're building a robot for fun or to enter in a competition, this set is sure to provide hours of entertainment and imaginative play. NOTE: this is the complete set (all parts and instructions book).