If you have one of these posts now & are replacing the worn sisal rope portion, make sure you verify your core size and wall thickness.The core size is the diameter of the wooden plug. This measurement eill be either 3" or 4".And the wall thickness is the thickness of the wall of the tube. It will range between approx. 3/16" and 1/2". Just give us these measurements so we can build you a top that fits perfectly to your original scratching post. NOTATIONS: Your Feline Design post will probably have this information on it already. Most Feline Design products made after 2011 have this information written by hand on the post ends. Typically, this information will include core size and wall thickness, model number, and a quality control code indicating that the entire post has been completely test assembled at least once to ensure easy assembly by the end user. For our designs with reversible columns, this means that the column has been tested, and then tested once more after inversion of the column. It probably means that it was tested a third time just to beat a dead horse. It is rarely tested a fourth time, unless the tester is one of our older testers. Product Details: This column is made in the USA, by American citizens. NO BASE IS INCLUDED. But you can purchase matching carpet for a base. You really have to search far and wide for a pole like this, but here it is. Includes fuzzy toy on a sturdy tether (daring your critter to rip it off). Tightly bound long-lasting 3/8" sisal rope (many other vendors use 1/4"). All critical connections are secured with industrial steel fasteners. Strong steel bolt, threaded rod, & handy tool included. Topped with a neutral beige carpet. These columns are intended as replacement components for Feline Design models B24tr, B35tr, B48tr or the B60tr, only. MAKE YOUR OWN BASE & you have a great scratching post! (Replacement bases for some of our more popular posts can be found here.) Once kitty tries this tough scratcher, she will not want anything else!. In fact, she'll be completely SPOILED FOREVER by our superior post! From a shop with a 26 yr. reputation of THOROUGHLY satisfying scratches. Transaction Details: We welcome all international purchases, especially from our Canadian neighbours. Canadian buyers, please contact us with your postal code. Just scroll down about an inch, and you'll be where you order.