Build this Rube Goldberg-like contraption to fling objects with abandon. This kit has hands-on learning about everything from hydraulics to propellers. Boing! Fling! Wow! Bonus--building models reduces stress, and increases organization, focus, and fine motor skills. All of our Curious Engineer kits are great Christmas and Hanukkah gifts. Bring all ages together for a fun engineering project. 13x13.5x2" box.