Unused Size: Approximately 45 x 40 cm Removable and washable cover It has an uneven surface, with a front and back, allowing for a secure seat for your feet and buttocks. O-shaped As everyone's perception varies, please check the condition in the photos. Stored at home. Please understand and accept this. Please refrain from purchasing if you are overly concerned about details. I believe it can still be put to good use. Black cushion with a ring-shaped hollow design effectively distributes pressure, suitable for long periods of sitting. The outer material uses breathable mesh fabric, which is comfortable to the touch and prevents stuffiness. The bottom is made of non-slip material for stability and prevents slipping. It has a handle on the back, making it convenient to carry and move, and is generally lightweight and practical. The cover is removable and has a zipper, allowing for washing and maintaining cleanliness. Suitable for use in offices, homes, cars, postpartum recovery, post-surgery, hemorrhoids, etc., and helps improve sitting posture and comfort.