This is the 12” (the largest) size wheel from the 3 wheel set. This size was too big for my body frame. It’s in excellent like new condition. These wheels are excellent for stretching and massaging the middle back. The cushioned foam is gentle but firm. The indention for the spine makes this very comfortable to lean back on. I usually can hear some adjustments mid back which can be a relief. It gently massages the tight muscles on either side of your spine as you roll. If you’ve been curious, this is a great way to try it out, without investing in the whole set.