Maio Benri Round Cushion I used this for only two months after fracturing my coccyx. There is a stain on the back. Usage period: 2 months Retail price: 4,399 yen (according to Amazon) If anyone is looking for one, how about it? Thank you. Back pain cushion, hemorrhoid cushion, cushion that doesn't hurt your buttocks, low-rebound, donut cushion, coccyx, office chair cushion, postpartum, zabuton, chair pad, chair cushion, portable cushion, round, wheelchair, large size, non-slip