Petzl Accessory Cord - Prusik Cord 4 mm

This 4 mm Petzl accessory cord is designed for making prusik knots and other friction hitches in mountaineering or rescue situations. It serves as a simple yet essential tool for backing up rappels, creating safety loops or rigging pulley systems when you need a reliable secondary line.

Its slim 4 mm diameter keeps the cord light and easy to handle, without taking up much space in your harness or pack. The narrow profile makes knot-tying precise, while the static construction means the cord holds tension firmly—critical when you’re relying on a prusik hitch to grip the main rope. Many climbers and guides favor this cord for its straightforward performance and dependable grip.

A static rope, unlike a dynamic climbing rope, is made to stretch very little under load. That low elasticity ensures your prusik knots bite hard and don’t slip when weighted, giving consistent friction and better control during ascents or as a rappel backup. In practical terms, this means fewer surprises and a steadier feel whenever the line is under tension.