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This Emitter (the part where the light comes out) is made to connect with the other modular lightsaber pieces that you will find in my shop. This part, like my other modular lightsaber parts is sized to accept a small flashlight inside like the one found here: https://www.harborfreight.com/3-12-in-Mini-Flashlight-69111.html
This is a smaller Emitter matches most of my handle pieces in diameter. This provides a smooth, elegant style. The front has a crenulated egde, like a castle wall, that gives it a unique appearance.