The inner core is replaceable and detachable: The built-in scratcher can be replaced separately after a long time without causing too much waste, and it is rejected for one-time use. PP shell, moisture-proof and washable: Use PP thick material to resist dirt and dirt, effectively waterproof, drop and wear resistance Concave and deep design is more secure when lying down: The principle of cat body engineering is in line with the cats sleeping habits. If you are tired, you can rest when you lie down Thickened and encrypted corrugated paper does not fly or hurt the claws: the cat will not fly the claws for a long time, and the ground is clean to protect the cats breathing Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.