This is a 6mm, 20m auxiliary rope. Weighing only 540g, it's lightweight and perfect for self-rescue during hiking or light mountaineering. Keep it at the bottom of your backpack. I purchased it in mid-December, but the rope was too thin for my belay device. I have never taken it out of the house. Purchased from: M.walk (Yamaaruki Kobo) Yoshio Okubo 〒115-0042 2-37-9 Shimo, Kita-ku, Tokyo TEL/FAX: 03-5939-6627 E-Mail: mw_works@pj9.so-net.ne.jp