The Hologram Cannister Plug is made from 316LVM Surgical Steel. There are several different ones available and alll imitate motion of some kind when tilted, such as fireworks, lips moving,eyes opening and closing or human heads changing into a skull only. Another cool aspect of them is that they al have a hidden compartment that serves as a good hiding spot for umm your o-rings (which are not needed for them), yea that's it.