Previously we'd get a small pack that had less than a dozen at Walmart or Target and my cats would love them but they would ALWAYS lose them, a box of 60 ensures pretty much an inexhaustible supply. The other nice thing is the little rattle inside the mice, I was very skeptical of it at first but my cats love it and don't even play with the ones that don't rattle anymore (like sold at Walmart/Target/etc). These mice are surprising thing is these seem to be more sturdy than the store bought ones which I found would fall apart after a few months; I haven't had any issues with these. I like to open the box every so often and let each pick one out, they'll just look at them for a minute and pick one up with their mouth and run off to play with it!