Narsil and Glamdring were the largest swords made for the movies, with the ones used in the movies weighing around 5 lbs. each. They were "aged" when necessary, and in some cases damaged and then cleaned to give the impression of swords that had been well-used yet well cared-for.
Glamdring was the ancient sword of Gandalf the Grey, who joins his friend Frodo on his trek across Middle Earth to destroy the Ring. Glamdring glowed in the presence of enemy Orcs, wielded its own sword of flame, and was created by ancient Elves. The inscription on Glamdring told that it was made for Turgon, King of Gondolin. Gandalf famously used Glamdring to kill the Balrog with a lightning bolt.
Frodo's sword was actually a dagger, but since he was a Hobbit, it was proportionally sword-like. Frodo's "sword" Sting, came from his uncle and adoptive father Bilbo Baggins, who took Frodo under his wing and taught Frodo the Elvish language, among other things. When Gollum attacked the Hobbits, Frodo used Sting to subdue him. Then, as Bilbo had once done, he spared Gollum's life, binding him instead to a vow to help the Hobbits.
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