The Mould King 26009 Rainbow Stepper is a building set that allows you to construct a functional Great Ball Contraption (GBC) machine based on the Rainbow Stepper design created by Berthil. (We get authorized)

The Rainbow Stepper GBC features a unique design that uses a series of gears and mechanisms to transport small balls from one end of the machine to the other, providing an engaging and entertaining experience for builders and viewers alike. The set contains over 1280 pieces, including gears, axles, and other components that allow you to construct a complex and intricate machine.

The instructions are easy to follow, and the set is compatible with other building block brands, giving you the ability to expand and customize your creation. The finished machine measures over 29" in length and 5" in width, making it an impressive display piece that is sure to impress fans of GBC machines and block building alike.

In conclusion, the Mould King 26009 Rainbow Stepper building set is an excellent choice for fans of Great Ball Contraption machines and block building. With its unique design, challenging build, and compatibility with other building block brands, this set is sure to provide hours of building and display pleasure.