My cats just love these! When the cat trees were new they repeatedly pulled them off so I just let them have them. While I didn't need 20 of them and would have preferred a smaller quantity (maybe 6 or 8), I couldn't pass them because I never see them in stores. My one cat, Tasha, acts like they're her babies. I'll give her one and her eyes light up and she immediately takes it in her mouth, carrying it around and talking to it. She'll play for up to an hour by herself, grabbing it by the string and tossing it in the air or batting it across the room.