Transmission plotôt well stocked (except for glycerin, the amount is a bit limited I had to buy quickly). Protective glasses are good but the gloves are not practical. The dyes are strong but they are easily rinsed. The instructions are detailed and it allows for many experiences all the more disgusting than the last. Only the stomach is a little disappointing. My son is 9 years and a half ammuse much to do these experiments he managed alone without problems.