Bet you can't guess what it's made out of. Titanium, the 22nd element on periodic table of elements and they wanted to make their 22 LR silencer out of titanium anyway - it was just meant to be. They used titanium with the SR71 blackbird and for knee replacements. In testing and development for this silencer Otter Creek Labs were battling industry giants left and right. Their design goals were to have a simple, easy to use, easy to clean, light weight, small, quiet 22 suppressor with almost no first round pop at as low of a price point as they could possibly make it. The rear mount of the Titanium is threaded 1/2x28 and is semi-permanently installed. That means it won't accidentally come off of the suppressor when you're trying to take it on and off the gun but if it ever needs to come off for any reason it can be taken off by Otter Creek Labs. They also made the mount threads longer to accommodate some of the longer threaded rifle barrels so you can use it without having to use a spacer or shim like you have to use with some other 22 suppressors.