I don't know what it is about these mice, but they are the only kind my cat will play with. I can only think that maybe it's the weight of them, as they don't have that lightweight "plastic" feeling that so many of these toys seem to have. My cat doesn't just like these, she goes CRAZY for them. She kicks them, bites them, and tosses them in the air so violently. It's hilarious! I can't find these mice for sale in stores anymore, so I'm glad to see them here on Amazon. I find that I have to buy them frequently because, as most small toys do, they get lost easily. I don't even know where they end up most times; they just sort of "disappear". But seriously, although my cat likes to play with many types of toys, these are by far her favorite.