New England Ropes' Tech Cord consists of a polyester cover surrounding a core of 100% Technora. This combination gives the cord extreme strength and abrasion resistance. As a result, the Tech Cord gets extremely high tensile strength. However, the reported tensile strength of Tech Cord, as with any rope, can be significantly reduced when used with a knot. The most recommended knot for this cord is a double fisherman's knot.