It can be an issue littlemiss. I tried our Syrian with one when we got him and had to take it out again because he was trying to chew at it and pull the bits of fleece off - so I got a sputnik and lined it with a hemp mat as well. I have put the Fuzzbutts cube in his cage now after testing him out with it - it seems he is too old to bother chewing it now lol! I think Chinese hamsters are a bit different too.
Syrians don't really need hammocks and there are plenty of other toys, tubes and sputnik hammocks for them
