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New and improved, award winning design! Catty Stacks are the Original Modular designer cat condos. The innovative alternative to traditional cat furniture, Catty Stacks are recycled, recyclable, and long lasting. Internationally patented and made in America from industrial-strength corrugated ultra Board. Don't be fooled by the cheap imitations. Mix and match colors and create unique shapes. New locking bridge component allows for new configurations and interesting obstacles for your pet. Easily rearranged and relocated to maintain your pet's interest. Great for multiple cats up to 20 pounds each. Kit comes complete with 2 cubes, bridge, and connecting clips. Buy multiple Kits to form larger climbing structures to promote healthy exercise. Catty Stacks, because cats love boxes!.