SRD:Rope of Entanglement
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Rope of Entanglement: A rope of entanglement looks just like any other hempen rope about 30 feet long. Upon command, the rope lashes forward 20 feet or upward 10 feet to entangle a victim. An entangled creature can break free with a DC 20 Strength check or a DC 20 Escape Artist check.
The rope has AC 22, 12 hit points, and hardness 10, and it has damage reduction 5/slashing as well. The rope repairs damage to itself at a rate of 1 point per 5 minutes, but if a rope of entanglement is severed (all 12 hit points lost to damage), it is destroyed.