Product review (5 stars): Price is for One, but I'm happy.
I'd assumed these would be plastic because previous "gap caps" I'd gotten were plastic, and the other choices said they were plastic.  Instead these were not only aluminum, but also had a magnetic strip to help hold them to the stove.  My biggest negative on these:  I wish the edges were flared down slightly so liquids would drip downward instead of clinging to them and wicking back to the gap.  They are a lot  narrower than my previous caps and at first I didn't like this, but after a while I grew to like this less-obvious appearance.  At the time I bought one, I thought "one" would be a pair.  After receiving it, I re-read the item description and saw it was plain enough and I didn't read carefully.  Having to buy a second one later made the total price higher than the other options, but since these are metal they should last for generations.  My previous plastic gap would crack in about a year caps, especially due to the uneven heat sources on the stove.