About this item Perfect cat scratching post:As replacement posts, you can use to repair your cat tree and cat tower if you are sure it meets your size requirements. Confirm your screw type:The screws types commonly used are M8 and M10.Please follow the method in the picture to measure the screw type of your original cat scratching post and choose screw type you need. Stable structure:Cat scratch posts refills are made of sturdy cardboard tube and wrapped with natural jute rope,they are durable. Natural hemp rope:Mechanical winding,not easy to loose,compact and strong.Compared with buying rope and winding it yourself, It is more convenient and economical. Package:2* posts(Screws included).