Thank you for viewing. I've used this for about a week. A circular cushion that provides a comfortable sitting experience with breathable mesh material. - Color: Gray - Shape: Circular - Overall diameter of the cushion: Approximately 40cm - Diameter of the center hole: Approximately 8cm - Material: Mesh - Zipper: Yes Instant purchase without comment is welcome. I would appreciate it if those who understand that this is a used item would purchase it. Thank you very much.