R4025 Depth: 16" Features: -Ring cushion.-Made of one piece molded foam.-Comfortably conforms to body contours.-Ideal for the relief of pain associated with coccyx injuries and hemorrhoids.-Removable, washable poly or cotton covers. Dimensions: -16" Ring dimensions: 3" H x 15" W x 16" D.-18" Ring dimensions: 3" H x 15" W x 18" D. Warranty: -Manufacturer provides 1 year warranty.