Nishikawa Pelvic Support Cushion Keeps

I accidentally bought two of the same item, so I'm selling one. I took it out of the box and the bag only to take photos for the listing. It is 44 cm wide, 41 cm long, and 18 cm high. For detailed information, including these dimensions and materials, please refer to the photos of the box. The color is listed as gray, but it's a grayish blue. It appears lighter in the photos, but it's actually darker. Please check the Nishikawa website for color confirmation.