THIS IS NOT A PERMENANT CAGE. This is way too small to be a cage for a ferret permanently. This cage is great, pretty easy to assemble, and I will be adding another 4 tier beside it to make it bigger. If you are budgeting just buy the four tiers for 100$, it's worth your money. The only reason it isn't five stars is the metal is easy to bend when rearranging the top part, luckily for me- my ferret is not a chewer and doesn't cage rage. The space is more compact than you think it is, about the size of the PetSmart clear things you can purchase ferrets from. Just more stimulating with the extra level. Perfect for a short-term use or for adding to it.