1. The impeller is too small for all hamsters. This back injuries can occur.
2. The running surface only consists of a grid. This can particularly be Zwerghamster undoing, because they can verhacken therein or reinrutschen with her little foot and hurt bad or even die!
3. The wheel is completely open on both sides. The hamster can thus easily be kicked out.
4. The wheel is often mounted high in the air. But that can go out badly, because if the hamster wheel from the flies (which often happens), it can be similar fractures . Add
I hope these reasons range them in order not to buy this product!