Because each cat loves the cat scratch board differently. Some cats like the cat scratch board very much, and they have to scratch seven or eight times a day, so that the cat scratch board will deflated in three months, so the cat scratch board needs to be replaced with a new one.
If the cat does not like the cat scratch board very much, then you can wait until the cat scratch board is broken and then replace it, so that you can save some money and not be too wasteful.
Because the cat's claw board is made of corrugated material, that is to say, it is made of raw materials by large trees, and it is more environmentally friendly to change it a few times.