522 ASSORTED PIECES – This set comes with 522 classic and micro K'NEX parts and pieces that "click" together, allowing kids to create anything they can imagine | 35 different models – the included instruction booklet shows builders how to create 35 unique models with its step-by-step, color-coded instructions. This toy is ideal for kids aged 7+ and up | Convenient storage – storing small plastic toy parts is easy with this plastic storage tub. keep everything together, including loose parts and partially built models

The set includes 140+ parts for a single child or team of 2 children to build 3 unique geared models: a crank fan, a car window and an egg beater. | Students will learn about gear configurations, gear ratios, rotational speed, mechanical advantage and more! | The experiment guide is aligned to National STEM standards and is appropriate for Grade levels 3-5.