zRig Static Rope Pulley Haul System 2to1 & 3to1 Mechanical Advantages with Progress Capture The light weight zRig system is an ideal choice for rescue, arborist, hauling and other industrial applications Kits Contains: 2 Pulley's , 14 ft of Prusik Cord, 2 Oval Auto Bi-lock Carabiners The pulleys are rated at 20kn for up to 13mm (&gt;1/2") rope The Purssik Cord has a Minimum Breaking Strength: 17.8kn (4005lbs) OPG Oval Auto BiLock Carabiners are rated at 23kn (5175lbs)