Catit Senses Play Circuit Entertains while engaging cat’s sense touch sound and sight. * Peek-a-boo track design allows cats to see amd swat the ball. * Swirl-patterned ball specifically designed to attract cat’s attention. * Additional tracks can be added to "grow the set" (sold separately) Entertains While Engaging Cat’S Sense Touch Sound And Sight. Peek-A-Boo Track Design Allows Cats To See And Swat The Ball. Swirl-Patterned Ball Specifically Designed To Attract Cat’S Attention. Additional Tracks Can Be Added To Grow The Set.