Sterling's RIT 9mm Eye to Eye Prusik cords eliminate bulky knots with out compromising strength. This prusik is made from high strength, abrasion-resistant RIT 500 cording to meet the needs of arbor professionals. To ensure the prusik cord moves and grip properly, the diameter relationship between the standing line and prusik loop diameter should follow the 60-80% ratio. Available in various lengths, the 9mm Eye to Eye Prusik takes the hassle out of tying knots.