Catit design a fun life with your cat, and the flat x wave track rolls like a coaster, so even cats who don't have enough play! The ball is new and you will be crazy for your cat. The sound makes your cat excited. (bell included) You can put a cat nip etc. inside. Stimulates the instincts of your cats by hiding the ball. Large window makes it easier to play! Easy to assemble. You can mix and match with over 100 layouts! Combine with the Catit Senses 2.0 series (sold separately) to create a playground that cats will love. Size: Approx. 45.7 x 22.0 inches (116 x 56 cm); Set Contents: Curved parts x 2, Curved parts x 6, Straight parts x 2, End parts x 2, Circuit ball (with bell) x 1.