Tiara, the chair you posted looks extremely fragile in fact, but the other you have seen are quite tough resins or methacrylate, so they should be sufficiently resistant to tear and wear (try avoiding to sit your elephant on them though... )
a great and "invisible" glass table by Compar, with a particularity: if you are in trouble searching where is your table, you will find it because of its coloured edges, like a bullseye