This is a self-supporting backrest cushion. It can be used on sofas and other furniture. I purchased it online, and it was advertised as usable on the floor, but I tried it on tatami mats and it slipped, so I'm selling it. It's practically new, as I only tried it out. A small cushion is also included. Size: Width 53cm x Depth 30cm x Height 42cm ■Materials: [Body] Natural wood, urethane foam, polyester wadding [Upholstery] Polyester ■Assembly: None ■Remarks: [Packing size] 52cm x 33cm x 41cm [Packing weight] Approximately 5.5kg [Product weight] Approximately 3.8kg [Weight capacity] Approximately 50kg