This rear seat is made of nice metal material, which is comfortable and durable. The surface is wear-resistant and non-slip, easy to clean, the back cushion is and comfortable. The back cushion is suitable for both adults and children. This product has certain convenience and you can use it with confidence. Features -Color:Black -Material:Aluminum Alloy -Size:40.00X24.00X13.00cm/15.72X9.43X5.11in -This backseat is designed for the rear rack of bicycles. You can use it without worry. -The excellent performance of our product will bring you a good experience. -Our backseat is a perfect replacement for most bicycles. Such as mountain bikes, exercise bikes, road bikes, kids bikes, etc. -Light weight and comfortable. The cushion make you comfortable even in long time cycling. -Simple to mount and effective in use, reasonable size for most bikes. You can use it with confidence. Package list: 1 x Bike Rear Rack