The Engino Stem Mechanics Levers and Linkages Set helps children learn how levers are used to increase the force for lifting heavy objects and how they can change the direction of motion. The set helps them learn how to create models with complex motion by connecting many levers together and how these linkages can be applied to various machines. They can build 16 working models, such as a seesaw, a movable weight scale, a wheelbarrow, a parking gate, a toy with moving figures, a pantograph and two types of linkages. They can find easy-to-follow building instructions for all models either online or in the booklet included. The booklet provides detailed explanations of the different scientific principles applied and incorporates innovative experimental activities for hands-on learning. A Quiz section is also available to challenge your newly acquired knowledge. Suitable for ages nine years and above.