M
Heavy duty and high quality
For Older Cats
Wobble-Free
This thing is built like a tank. I counted exactly nine sisal posts and nine plush ones which is plenty of support for five levels. The dual top perches are massive and padded really well. My Maine Coon usually hates cat trees because they are too small but he actually fits comfortably in the condos and the baskets on this one. Best purchase this year.