Petsfit 31" Scratching Post,Replaceable Card Board, Made Of Corrugated Paper Corrugated Carboard Crafted in REPLACEABLE corrugated cardboard. Petsfit 31" Scratching Post,Replaceable Card Board. Durable post allows cats to get a full stretch. DO NOT SELL THE CARDBOARD ALONE. Easy set up in seconds with replaceable card board. Dimension 31" high to allow cat to stretch vertically. More details please refer to the second PICTURE. Sturdy base eliminates tipping and wobbling.