A fun kit that you can use to build either a roadster motorcycle or a dragster! The kit contains more than 90 parts to build 2 different models and comes with working transmission mechanisms. The illustrated manual explains how to assemble the roadster motorcycle and dragster, step-by-step. There are lots of special parts, such as the transmission module, gears, connecting rods, pistons and many more so you can discover how vehicles work. The “Science & Play Build” app with 3D interactive animations, integrates the play and build experience by providing assembly tips for all models.