This is a genuine backrest fabric for the Alinco "Hanging Health Machine". - Color: Black - Material: I believe it's nylon-based. - Size: Approximately 49cm x 16cm It's made to be threaded through the poles on the left and right sides (see 3rd photo) and is a durable fabric. I purchased two directly from Alinco, used one, and kept the other one new and unused. I've since disposed of the main unit. I would be happy if someone could make use of this fabric. Thank you! (Will be shipped via anonymous Mercari delivery. Planned for Nekoposu, but may be changed to Yu-Packet.)