The majority of metal caskets available on the market today are known as "protective" caskets. This terminology reflects that they are manufactured with a one-piece rubber gasket that runs around the inner lid of the casket.
Once closed, a locking mechanism draws the lids onto the base and the gasket forms a seal. This protective seal protects the deceased from the entrance of air and other gravesite elements.
Many higher quality metal caskets utilize a sophisticated magnesium rust inhibitor process. Metal caskets are commonly manufactured in 20, 18 and 16 gauge metals, where 20 gauge means that it takes 20 sheets of that metal to make one inch. Then a 18 gauge steel casket is heavier, because only it takes 18 sheets of that metal to make one inch.
Interiors are tastefully coordinated in a variety of materials from crepe to velvet allowing for a range of pricing to meet a wide variety of budget concerns.