Upgrade 4 Layers Of Track It Has One More Layer Than Most Trackbles. The More Layer And Ball There Is, The More Fun The Cat Will Be. Detachable Design: It Can Be Detached Freely, Easy To Install, And Easy To Clean. Upgrade Bell Ball / Catnip Ball 4 Layers, In Every 2 Layers There Are Two Balls, One Of Which Is Catnip Ball And The Other Is Bell Ball That Is Glowing. The Cat Loves This More An Active Cat Can Play The Ball All The Time . Multiple Ways To Play, Not Boring There'S A Hole At The Top. You Can Insert And Remove A Cat Fishing Rod, Play With The Cat. Such Playing Styles Can Be More Fun For The Cat Smooth Corners And Non-Slip Bottom, We Use Safe, Non-Toxic And Environmentally Friendly Pp Polypropylene Resin, Which Is Odorless, Wear-Resistant And Has Good Bite Resistance. The Corners Are Smooth And Free Of Burrs. The Cats Can Play Safely There Are 4 Pieces Of Anti-Slip Mats On The Bottom, More Fixed To Prevent Animals From Moving While Playing. Offers Our Customers A Return Guarantee Or A Replacement Guarantee Of 6 Months From The Date Of Purchase Our Goal Is To Offer The Customers Desired Products And Satisfactory Service. Please Let Us Know If You Have Any Questions Or Concerns. We Will Do Our Best To Fix It For You.