Technora prusiks were designed specifically with arborists in mind. They will lock while pulling in one direction, but allow you to easily push up or down with slight adjustments. Prusik loops are perfect for tree work, rappelling, and use as rescue loops. They will grab friction and resist abrasion at incredible levels. With an eye sewn by experts at Pelican Rope, these prusiks are designed to survive longer in some of the most extreme conditons.