A lightsaber is a fictional energy weapon featured in the Star Wars universe. It consists of a polished metal hilt which projects a brightly-lit energy blade generally about 4 feet (1.22 meters) long, though some lightsabers are of a different length. The lightsaber is the signature weapon of the Jedi order and their Sith counterparts, both of whom can use them for close combat, or to deflect blaster bolts. Its distinct appearance was created using rotoscoping for the original films, and digitally for the prequel trilogy. The lightsaber first appeared in the original 1977 Star Wars film and every Star Wars movie has featured at least one lightsaber duel. In 2008, a survey of approximately 2,000 film fans found it to be the most popular weapon in film history. The lightsaber's energy blade cuts or burns/melts through most substances without resistance. It leaves cauterized wounds in flesh, but can be deflected by another lightsaber's blade, or by energy shields. Some exotic saber-proof materials have been introduced in the Expanded Universe. An active lightsaber gives off a distinctive hum, which rises in pitch and volume as the blade is moved rapidly through the air. Bringing the blade into contact with another lightsaber's blade produces a loud crackle.