The green MEOW PLANET with aroma: place the finest quality catnip ball inside, full with all-natural smell to satisfy your cats. The orange MEOW PLANET with playful sound: place a little bell inside to cater to the acuity of your cats. Two different colours of the MEOW PLANETs come with PETKIT 4 IN 1 CAT SCRATCHER, can be played independently, can also be a replacement of the PETKIT 4 IN 1 CAT SCRATCHER. PETKIT offers better play experience by creating more play ways to have fun depends on your fur babies' different needs.