While this product is definitely "sturdy", the top layer of cardboard (which holds the balls in the block) falls off just enough that the balls cannot roll easily/freely around the center of the piece scratch cardboard. While the kittens play with this for about 30 seconds, they then pick up the board and move on to something else. I'll take out the balls (they like balls - maybe because of the noise they make?) and recycle the rest.
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