This unit is made to fit onto our Model 6850 Toilet Seat Cover with Reducer Ring, or a standard toilet seat, for both open front and round styles. The vinyl-coated foam is easier to clean than hard plastic. It can be attached to any toilet seat, either by snapping it onto the front of the seat or clamping it to the rim. This unit is great for traveling because it's small, lightweight, and very discreet. This item comes standard with a foam seat cover mount.