These are literally the ONLY mice my cats will play with.  They are fussy (what cats aren't?) and do not like any other kind of mouse.  And, even within this box, they only want the black or the gray ones ... they won't play with the white ones.  They also won't play with the rainbow mice - which have the sound pellets in them.
Fortunately these are well made ... made well enough that even when the dogs get ahold of them (which they do nearly daily) they aren't able to take them apart in seconds!
I buy one of these wedges every month -- the cats have to have a new mouse every night.  If you're a cat person, well ... you understand ... (anyway, the dogs so often get them that we have to replace them frequently).