This is a Silent Wheel F40. I bought it new, upgrading from a 30, but it doesn't suit my needs, so I'm selling it. I only used it for one day, so it's in good condition with no urine stains, etc., but there may be minor scratches as it's a plastic product. I have the box, but I was planning to dispose of it immediately, so it has fold marks and isn't in pristine condition.