The Tauren tube itself is made out of either brass or copper (in my case, brass). The cerakote is very hard-wearing and has a nice feeling and texture to it. The engraved logos down the side and on the top of the tube is quite deep and contrasts nicely with the black cerakoted body. The individual serial number at the bottom is engraved quite lightly in comparison to the logo above.
On the “back” of the tube is a curved recess that fits perfectly into the webbing between thumb and forefinger, giving the tube amazing fist appeal.
4 battery venting holes are drilled into the bottom threads around the button, which means your batteries should be placed in with the positive down. As shown in the photo below, there is a small rubber insulation washer glued into the top of the tube where the negative of your battery will sit. One of the biggest advantages of this tube is that it can take an 18650, 20650, 20700, or 21700! I have used all three sizes of battery and didn’t have any battery rattle whatsoever with any of them.