Love it or Fear it
YMMV. My partner’s solo female cat (under 2 yrs) LOVES crinkle balls, can’t get enough of chasing them on the hardwood floor. My 6 boys (under 2 yrs) were afraid of them! I was astonished, had thought they would love them too, but no, they never touched them. The package I bought went to the solo femalr kitty’s stash!