These are the best toys I've ever purchased for my cats (and I have purchased many). Our youngest (3 years or so) cat is especially in love with these and plays with them all day and night, even long after they have been out of the "cat nip bag." I think the natural fibers gives them a natural bounce that makes them seem "alive" which keeps the cats interested. I also love them, since they are natural, soft, non toxic, simple, quiet, and they look nice just laying around the house :) The color palette is also really nice. I will definitely be purchasing more just to have them since it makes my cats so happy and I'm a bit sad about the idea of possibly not being able to buy them in the future! I honestly can't imagine a better cat toy.