This is a normal replacement item that seems to last about three years. We've found that the more expensive versions of this mat don't last very much longer.
Had to return it because it slipped on the carpet. The teeth weren’t long enough to grab the carpet. Sorry but it did not work for us and wouldn’t recommend it.
I did not like the way it was folded -- hard to get it to lie flat - ddifficult to cut some off to fit into my space. Please sell smaller carpte that is not rolled up and needs to be flattened.