Used once for a short time in a park for practice. The Tie Block was not used during the rope trial because it could damage the core material. The rope and bag are sold as a set. Manufacturer details below: The "Rad Line" is an ultra-light and compact hyperstatic cord designed for skiers who perform crevasse rescue, rappelling, and roping up on glaciers with crevasses. Its low elongation, flexibility, and rough sheath make it easy to handle and provide high operability. Available in two lengths: 30 m and 60 m. Product Details Ultra-light, compact: 22 g per 1 m Lightweight and compact, easy to carry in a backpack Special braided sheath: The special sheath reinforced with high-modulus polyethylene (HMPE) is compatible with the "Tie Block" ascender and the "Micro Traxion" self-jamming pulley. The rough sheath and flexible cord provide excellent operability and high braking power during rappelling, when falling into a crevasse, etc. Hyperstatic: For rescue use and to reduce dynamic loads during rappelling, crevasse falls, etc., the elongation of the hyperstatic cord is less than 2%. Can be used for roping up when crossing a glacier with crevasses. Note: For the correct use of this cord, please refer to the technical information at www.petzl.com. Specifications Diameter: 6 mm Weight / m: 22 g Materials: High-modulus polyethylene (HMPE), polyester, nylon Certification: CE EN 564 Elongation (under load): less than 2%