Really study, does not tip over. Made with real wood, not cardboard tubes. And it is nice that it has 3 options for the kittens. hmmmm...do they want to scratch on wood, carpet covered post or sisal rope? ... up to them now. I also like that it is made in the USA and has no toxic elements. I like that it is discreet as I place these in the living room. I picked the brown color. The cats (kittens really) have another room - their room -where the big cat trees are - it is a playroom so they have toys, views outdoors, sun and cozy places to sleep.