CARLOS Extension Set for Mouse and Hamster Cage with 7 mm Wiring

I ordered this extensions as a bit of a gamble to see whether it would fit my Barney cage from zooplus (they were 2cm out both width and length of each other), however they work together super well!Only complaints would be that without a platform the ramp is very steep and my hamster was too scared to use it. With the platform it works well though. Also, because of the hole for the ramp you can’t make the bedding super deep on the top level (I’ve made some barriers out of cardboard to help with this).She absolutely loves the double space and uses both layers every night! Would highly recommend if you want to give your hamster an upgrade.