The listing, Used training wheels for kids bike - free US shipping has ended.
My daughter used these a few times (maybe 4-5) & then learned how to ride her bike without them. They seem 100% usable to me, though there is one spot maybe 1/2" long that's not as smooth as the rest. I wouldn't by any means call it flat, but it's not as smooth. She was still using them just fine till she learned. They have been used, and the wheel part is white, so they look cosmetically dirty on the wheel part, but there is nothing bent or dented or warped & you get all the nuts & bolts that go with it to attach them. They are a standard size & adjustable. While they may not be new, you'll be getting a great deal, as I am offering free shipping on an item that weighs a couple of pounds. And it might even go for a single credit! Frankly, my husband wanted to take them to Goodwill, but we'll spend as much on gas getting to our local goodwill than we will on postage. :)