Product review (5 stars): Liners do the job.
Since I was experiencing trouble finding these at the stores nearby I was glad to find these on line.  Since I have white gas burner surfaces they get dirty easy.  I was able to order these in 40s and not in packages of 6 only.  Saved money buying in this quantity and have a large supply for the year.  They are flexible enough to mold to the shape of the burner bowl surface but thick enough to still be strong and not tear.