It’s a cat toy designed to be the size and general shape of a mosue. Though this toy can be made with any yarn to make any size you like. I suggest using a hook 1-2 sizes smaller than the yarn recommends.

I used a 3.5mm hook with worsted weight yarn.

This pattern is free

It was made from scrap yarn so the yardage is very vague, but I doubt it’s over 10 yards if that.