This is a step-up potty training seat with cushioning, compatible with many types of toilets. - Type: Step-up potty training seat - Cushion material: PVC material - Compatible toilet shapes: O-shaped, V-shaped, U-shaped, oval, smart toilets, square Used a few times! One cushion seat has been used, and the other is unused. I used it a few times, but my child was able to use the toilet on their own, so I am selling it. Thank you for looking.