The size is approximately 35cm in diameter and about 3cm thick. I bought these intending to use them in a Japanese-style room, but I didn't end up using the room much, so I'm selling them. Purchased in April 2021. These are no longer sold. One of the three was stored in a bag. The other two were also kept in the corner of the room, so they have almost no signs of use. They are well-made, and the seating surface is firm, with a material that seems durable. Cushions, stylish, for flooring, floor, round, compact, non-slip, firm, doesn't sag, doesn't flatten, blue. ※I found one more, so there are a total of 4!