Be mesmerised by this 45 piece chain reaction construction set. A great introduction toy to learn STEM concepts such as gravity, force and momentum, and how they can create a chain reaction. This 45 piece set with wooden dominoes, balls and components will inspire creativity and build skills like perseverance, STEM problem solving and critical thinking. Combine sets from the full range and see how big of a circuit you can create. Instruction booklet included. For ages 8 and up. WARNING: CHOKING HAZARD - Small Parts. Not for children under 3yrs. WARNING: CHOKING HAZARD - Toy contains a Marble. Not for children under 3yrs.