Three things in one frame: a corrugated scratching face, a tunnel to run through and a wooden platform to sleep on - so a cat that is bored of one moves to the next without another purchase. Dense corrugated cardboard has the give that claws want and lets air through, unlike a solid board. The 10 x 14 in cardboard panel replaces when it is worn out rather than the whole unit. It measures 18.5 x 12 x 21 in and weighs 10 lbs, heavy enough to stay put. Engineered wood in a natural finish.