Product review (1 stars): Buy heavy duty foil instead, these are flimsy and poorly stamped.
Having purchased foil liners before, these are thin, poorly stamped and a horrendous waste of money.  At a bit more than fifty cents apiece, these are worthless.  SAVE YOUR MONEY.

For those who may wonder (based on reviews for similar products) - these are marginally thicker than two sheets of heavy duty foil.  They are far too thin and flimsy to be used without a drip pan.

There are decent foil burner liners out there, but I will not buy the next set online.