Thank you for viewing. I purchased this around the summer of this year, but I haven't used it much and have been storing it at home. There are no noticeable stains or scratches, but please understand that this is a used item, and those who are concerned about minor details should refrain from purchasing. [The following is a quote from the product description] Designed by a chiropractor, this product aims for a posture that reduces the burden on the lower back. When sitting in a chair, unconsciously leaning against the backrest tends to tilt the pelvis... This seat makes it easier for the pelvis to stand up, guiding you to a natural S-curve posture that reduces the burden on the lower back from the neck to the buttocks. 1. Sacral guard: Supports the pelvis from behind to stand it up, preventing the back from rounding and leading to a posture that reduces the burden on the lower back. 2. Front guard: Prevents sliding forward and crossing legs. Sliding forward while sitting puts a great burden on the lower back. This guard supports from the front to prevent this. 3. Iliac guard: Prevents the pelvis from opening to the left and right. It gently rocks to adjust the pelvis & makes it easier to sit for long periods. If you sit still without moving, pressure tends to concentrate in certain areas, making it difficult to maintain posture. This seat has a rounded bottom, so you can gently move your body left and right, and forward and backward when you get tired of sitting. This relieves the burden and makes it easier to sit in the seat for a long time. Body size ◎ Approximately 41cm wide x 37cm deep x 24cm high ◎ Weight: Approximately 1.8kg ◎ Seat load capacity: 100kg or less Reference price: 13,900 yen