K&H has reinvented the wheel when it comes to cat scratchers and refill boards are available here! The patent-pending K&H EZ Mount Scratcher Kitty Sill Cradle is curved to accommodate even the pickiest of kitties. It utilizes our innovative suction cups to mount to any window. The cardboard surface can be used for basking in the sun or to groom cat claws. Free catnip included with this cat window perch! Cat's will no longer want to scratch your furniture with the K&H EZ Mount Scratcher Kitty Sill Cradle in their mitts. Helps keep nails healthy. Two styles of refills are available separately for this product, the Kitty Sill Refill, and the K&H EZ Mount Kitty Sill Cradle Refill (pictured); both fit this frame. Designed by K&H with OVER 20 years of experience in creating safe, innovative, quality products for pets.