Features: Petlinks System Corrugated Refill for Scratcher's Delight(TM) Refillable Scratch PostThe clever, refillable scratching post (sold separately) uses these corrugated scratch disks that cats really love to dig their claws into. Your cat naturally has a scratching instinct because scratching helps keep claws in fine shape by removing the irritating scale that grows with the nail. Plus, scratching just feels good! Simply remove the old, worn disks and replace with this new fresh column of disks. You will also be happy to know that these disks are made from recycled material and are recyclable with cardboard! Petlinks Pure Bliss(TM) organic catnip is also included.