I would agree with Ken, but i doubt a cat would be interested in the rubber surround. It is a rather small edge and cats more prefer to find a large carpeted-like item to draw down on their nails.
The other option is to have the cats declawed if they are really into pawing away at anything whatsoever. There is a laser surgery available that is far less traumatic on cats than older methods. This also assumes that you are a responsible cat owner who doesn't let their cat outside to roam freely...
Cat training is possible but better if they were still kittens or it may consume much of your time.
