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The model that uses the same principle as a Pneumatic engine, but has a certain game element added to it! Blow on the top gear and the whole system comes alive. Depending on the air pressure, the arrow will point to a quirky picture that symbolizes the thing you can do according to your strength. Thanks to the pictures it also looks very cute as a décor element! Features: Self-propelled, mechanical wooden model assemble kits. Blow on the top gear and the whole system comes alive End procrastination and indecisiveness while demonstrating basic mechanics with UGears Dynamometer 48 Parts 5.8 x 2.8 x 6.7 in 2 hour to Assemble 14+