3-in-1 Building Sets - Not only RC tracked racer, You also can build Tumbler Robot and Spin Car. You can disassemble and build the second model from scratch. What's more, this set is compatible with our Orange model, offering a total of 6 models to choose from. a multiple build-and-play fun. Easy to Assemble - Build your own car or robot by following the step-by-step instructions Book. Takes time, but worth it.