Cat Scratching Board with Bell-Ball

9 1/2 inch diameter. Cat Scratching Board with Bell-Ball. Foldable Cat Scratching Post for Indoor Cats - Durable, Twistable Cardboard Toy. Engages Natural Feline Behavior, Perfect for Playful Felines, Twist into two different shapes. Ball included. Cats are very intrigued with trying to remove the ball. I bought two thinking they would not be so sturdy since they are made of cardboard. Comes in a long strip that connects with a magnet at each end. My four cats haven’t tired of it yet.