
Here's a little bit of technical readout about a Lightsaber.

Lightsaber handles are 24 to 30 inches long, generally.
For energy it uses power cels and a crystal (multiple crystals may
be used)
Handles are made from durasteel, like the name says, it's very durable.
Power cels transmit energy to the crystal(s).
The length of the blade depends upon two things: 1. How many crystals
are used, and 2. The length the Jedi wants.
The color of the blade depends upon what kind of crystal is used.
Lightsabers can not cut through other Lightsabers, but everything else
is fair game.
Wasn't that fun? Now here's some facts about Jedi wielding the
Lightsaber.
Training Jedi use Lightsabers set on a lower power, so that fellow
trainees are not injured (From Jedi Apprentice books)
One of the tasks of a Padawan Learner is to construct a Lightsaber.
Lightsaber training is very important at the Jedi Temple, trainees
are blindfolded sometimes to improve saber wielding, and Force interaction.
(Jedi Apprentice books)
Lightsaber's are the Jedi's main weapon, but their ally is the force.
Make your own Lightsaber! Visit Obi-Wan's
Jedi Academy!