The boxes of these products are sun-bleached on the front having sat in a window for a little bit too long but the contents are perfect inside. The junior inventor kit is a fun way to get little humans experimenting and learning through play. Each kit contains three experiments; showing them how to make a mechanical grabber, a crane and a climbing frog. Each experiment is carefully devised to teach them scientific principles, such as momentum, potential energy and conservation of energy. We particularly love how the elements can also be mixed up to conduct and invent wonderful new experiments and devises. Suitable for 4 years plus. How does it come in a cardboard box 24 26 x 5cm. each box contains 37 pieces as well as a free instruction app.