Star Wars Chopstick Lightsaber R2-D2 Kotobukiya

Inside a chrome cylinder are one or more kyber crystals. These gems are found only in a few specific places in the galaxy, and have the ability to concentrate raw energy into a beam.

Saber construction is equally perilous, as a misaligned crystal can cause an explosion. Only the Jedi and Sith make them; no merchant has ever produced one. In fact, saber building is one of the most important stages in a Jedi's apprenticeship.