I have owned a rotastak cage and these tubes. They are terrible.
An adult syrian cant comfortably use these and a dwarf can only use them if they are not vertical. There are no grips for the hamster to use when climbing making these tubes dangerous for hammy because he could slip and fall and ultimately injure himself.
The tubes scratch easy and hammy can chew them in no time, they are not very secure either expect an escaped hammy every now and then. They are also hard to clean and have poor ventilation.
Overall I would not reccomend these at all.
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