Thank you everyone for the wonderful advice and super links! I do believe you are right about the material of the scratching posts that we have. It's not the same material as the tapestry chair in the living room, which is the favorite of theirs. I am going to look into getting a different material, the kind of material similar to that of the chair. I do believe that could do it. I honestly think I can shake this habbit of theirs, it truly is an expensive one! They are SUCH nice cats, they love everyone, they are so sweet! I thank you and Mia & Mewton thank you too. They LOVE their fingernails and they want to keep them!

If you have any other suggestions please do reply. I'll either buy a new post with fabric similar to the one of the chair that they LOVE to shread or I'll make one. That sounds like a fun project, I have never built something but hey, i'm doing it for a good cause