This is a cushion for working on watches while they are still in their cases. I mainly used a Bergeon cushion, and this one was used as a secondary. I'm selling it because I no longer use it. There are very small scratches. See photo 6. Diameter: 59mm Height: about 12mm Weight: 11g There is no indentation in the center. It's a simple construction. It's light, so you might be surprised at first. It doesn't sink in very much. It's sufficient for use as a secondary. You can put hands on it, or temporarily place circuits on it; the uses are endless.