Length: 20.5m (as stated) Width: 37cm It feels smooth, so I believe it's silk, but I can't determine if it's pure silk because there's no certification. Thank you for your understanding. I am listing many unused items, but they are all pre-owned. I inspect for stains and blemishes, but there may be oversights. Please understand. I try to ship as quickly as possible, but there may be delays due to holidays. Thank you for your understanding. I do not respond to messages or ship items on Mondays. Please wait until Tuesday. I am offering items at reasonable prices. Thank you for your consideration.