Product review (5 stars): Lightweight, large, but do the job
Yes, these are rather flimsy covers, but they do exactly what they are meant for: Cover up the burners and keep grease splatters from hitting the unused burners. Remove them before you turn on your stove.

By the way, these are HUGE. I use the two small ones to cover up the big burners, since I hardly ever use more than 2 burners at the same time. Somewhere down the road, I have two spare covers :-)