!00% not "household grade carpet".  A very cheap stuffed animal fabric on wood (see photo).  The sides are just stapled on and will not hold up, otherwise the wood is sturdy.  You get what you pay for on this one.  
The grey is a charcoal grey, not the light grey as shown in the photo.  
The description needs improvement - my 11lb cat seems happy and it is sturdy for him for now!