These valve stem caps are made in the U.S. from once-fired American-made 40 caliber rounds. Obviously they don't have any live primers, powder, or any explosives, so they're completely safe to use.

As a preliminary to establishing a frozen valve bank for replacement surgery, the possible effects of the proposed freezing and thawing procedure on tissue structure were assessed in 16 human ...

A unified CO2–amine reaction mechanism applicable to absorption in aqueous or nonaqueous solutions and to adsorption on immobilized amines in the presence of both dry and humid conditions is proposed.