Mounting 1:30. The instructions are only in German but is doing well in reading the diagrams. My little 3 year old son plays well over half, he adores. But it will very quickly become limited and although this article is presented for children 3 to 8 years, I would rather say 2-5 years max because of the little space between the bars on different floors, and lack of height as a whole. We were therefore disappointed when the assembly was over. Otherwise it's fun and interesting to understand the balance, risk-taking, insurance, imagination, as strength. My little son invents acrobatics and finds himself the one that brought him the most pleasure. Solid structure, secure, (can easily be slippery anyway), nice colors. We do not regret this purchase, we would have just liked the dome and (or) the summit are higher so he could enjoy it longer. Another possible use, to a cabin by covering sheets.