I purchased this around 2018, but it has been stored in a closet without ever being used. I believe it is a 22-inch size. Although it is unused, upon opening it from the storage bag, one of the rubber belts had deteriorated and broken (see photo 4), so please replace all the belts before use. Due to my work, I travel frequently, and I will need to prepare a cardboard box for shipping after your purchase. Therefore, it may take some time to ship the item.