RNR 8mm Prusik CordRNR 8MM PRUSIK CORD 300 FOOT SPOOL Rock N Rescue has gone back to the drawing board to produce a new 8mm prusik cord as a companion to our line of 1 2 ropes. Our Prusik cord strikes the perfect balance between firm and supple. We have engineered the prusik cord so that the rope has enough give to grip the rope, but not be so mushy that the knot locks up. The results.. a smooth, controlled movement over the rope, greatly limiting sheath slippage or