We brought our new Syrian home yesterday! He currently has the standard 18cm wheel that comes with the Savic hamster heaven, but I'm looking for a bigger one. I've ordered the Trixie 28cm from Amazon (it had excellent reviews), but I'm having second thoughts about it - mostly about the fact that it's not an 'open' wheel, but has a cover over the front, with holes in it, and I've heard hamsters can get trapped? Can anyone recommend a better one?