This is a G-Zero cushion. It reduces the burden on your lower back and provides firm support for your buttocks. It's a cushion for chairs that makes it less tiring to sit for long periods. Size: Approximately 36cm long, 41cm wide at the longest point Color: Gray This is a used item. I believe there are no noticeable stains. It has been stored at home, and I have inspected it myself, so I will sell it to someone who understands this. It will be folded for shipping.