ZERO percent interest
Sorry, I hate to be negative but I bought these for my cat considering he loves rolling around all sorts of soft and hard toys but I've tried each one in the pack with my cat during his chill playful times and his manic crazy times and every time I offer one of these to him he just turns his nose up and walks away.
Side note, these smell awful. I don't know what was put inside these, catnip or some fragrance to entice the cat but it smells like mold. Sorry, but there was no positive in this.