In our new series of Cat Trees there is something kitty can really curl up in our Mushroom Tree w/Tub. With a 16" diameter sleep tub there is plenty of room for two. Available in three sizes our Mushroom Tree, like all of our trees, have a solid wood center post with braced shelves. The 30" and the 48" trees come on our sturdy 20"x 20" base. The 72" trees have the 24"x 24" base, wide and wobble free as the rest. All the shelves will support over 100 lbs purr-fect for those big boys and girls. Strength and durability are trademarks of the 7th Heaven Cat Furniture line. You will notice all the Mushroom Trees are braced on their bases on all four sides! Your kitties will appreciate the stability when climbing on and jumping off. Call us for shipping quotes for the 72", as we can't ship this via FedEx.