I would imagine that the bridge thing is the same wood as the knot nibbler since they are the same company.
But if you find out different let me know! I am thinking about getting the flying saucer too. I think Ingram would be ok with it, he doesnt seem to like to chew on plastic. He has an igloo right now and another plastic wheel and hasnt bothered either one. But I do have plenty of other chewables in the cage already. I too went on a shopping spree today
I got some lava rocks and he hasnt even touched them so that is a bummer. I found a lava ledge at petco, it is the same thing as the sleeping ledge just made out of the lava rocks. Might get that later. I also got him a ferret hammock. He seems to like to snuggle. So far so good. No bitting or chewing he just sits there and chills.