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Mechanical experiment set suitable for age 6 years and upwards. Build your own track to learn about potential and kinetic energy. Create a never ending cycle for marbles that includes electric motor, Cams and cranks and trampoline. Instruction manual included, with assembly guide and scientific explanations. Requires 2 x AAA batteries (not supplied). this product conforms to EN71 and the toy safety Directive. PLEASE remove all packaging before giving it to your child.