This is a footrest purchased on Makuake. I bought two, but I'm selling one since I'm not using it. The following is quoted from Makuake: Contents: One footrest Dimensions: W460 x D320 x H330 (mm) * One-piece design, no assembly required. Main Material: Polypropylene (PP) Pad: Fabric + Sponge Weight: 1.8kg Color: Navy * The crowdfunding price for a single unit was 7,850 yen.