Elven Rope

In the movie, Elven Rope is the gift given to Samwise Gamgee by Galadriel. It helps him and Frodo Baggins get down a cliffside and unknots itself after that so they can keep it with them. When Gollum is bound by it, he complains that it burns him.

In the book, Sam simply takes a coil of Elven Rope from the three coils put in the bottom of each boat. Made of hithlain, the ropes are lightweight, gray, strong, and silky to touch. When Frodo slips while climbing down a cliffside and temporarily loses his sight, the rope, gleaming faintly, is the first thing he can see. After both Frodo and Sam have made it safely to the bottom, the rope comes down when Sam calls it. As in the movie, it burns Gollum.