3 pack of Freznel lenses

I got these from an ebay seller webclothing10 for $1.08 shipped from the UK no less. They arrived within a week.

They work pretty good as magnifying lenses, and are quite thin. I thought they might be handy in a kit for fire starting or just as a magnifying glass. I have yet to try them as a fire starter.

I put one inside a small ziplock style bag and put it in one of my fire kits. I want to see how being bent like this affects it down the road.