The other reviews are correct when they say the directions for assembly are poor. Strongly 
suggest printing out a picture of the tree before you assemble because neither the box o
the instructions have one. Had problems with the rolls in between
the posts until we figured out they just snap in holes and they seem to have added another shelf for stability which the picture does not show.  All that aside this is the best tree we have ever gotten. It has a wide base and the poles are centered on the upper beds which also helps keep it stable.  Our cat loves it and has even used the upper middle poles for scratching which he has never done before. Well worth the headache of assembly.