See all the pictures it is used so on the gel it shows 16x18 for the gel Enhance your comfort with this versatile Purple Pillow Gel Seat Cushion, perfect for use in the office, car, or wheelchair. Designed to provide excellent lift and support, this cushion helps alleviate pressure and discomfort during long periods of sitting. Key Features: Versatile Use: Ideal for office chairs, car seats, and wheelchairs. Comfort and Support: Gel technology ensures optimal support and pressure relief. Dimensions: Approximately 16x18 inches without a cover. Condition: Pre-owned, offering great value. Please note that this item is pre-owned. We have included detailed pictures to provide the best view of its condition. Feel free to reach out with any questions or for additional information.