It is very huge and it makes you feel full. Only for persons that love big insertion and extreme feelings. It can be use for anal or for vaginal penetration.
These are great quality pieces (feel amazing to the touch) but since they don't have much stretch to them, they'll only be effective if one gives you the perfect fit. For example, if your "equipment" falls between the two larger rings, the largest will be too big and the medium won't stretch enough to be comfortable.