This set of two dog tags come with chains.  The first dog tag is engraved with "Toxic Water Victim with the US Flag/Skull flanked the the Biohazard Symbols."  The second dog tag is engraved with "(Rank, Name and dates of birth and death) or (toxic water exposure dates.)"
 
Each dog tag is about 50 x 29 x 1 mm/ 2 x 1.1 x 0.04 inches, and the round hole of the disc is approx. 3 mm/ 0.1 inch in diameter. They are sturdy and reliable, not easy to break or fade, and lightweight for wearing.