It seems like it’s still in the development stages though. One time my dog almost choked on a bottle cap while we were tailgating and now I am always looking out for them and picking them up.

Steel bottle caps are one of the easiest things to recycle. An amazing 70% of each cap can be reused to make more bottle caps or other steel products. I can fit 75 steel bottle caps into one empty steel can (vegetables, baked beans, etc.), then I close the top and lock it by inserting another steel bottle cap between the gap. That one filled steel can is equal to four empty steel cans by weight. That’s a lot of steel being recycled, and it’s much better for our environment than throwing them into the trash which ends up in our landfills.

Check out this website:
http://recyclingweek.planetark.org/recycling-info/bottle-tops.cfm

Here’s an excerpt:

Steel (Twist) Tops

The easiest way to check if a top is made from steel is to try to pick it up with a magnet. If a magnet sticks, its steel.

Steel bottle tops are too small to go straight in the recycling bin; they will fall through the sorting machines. The best way to recycle them is to collect them in an empty steel can and when the can is about half full squeeze the top closed and put the can and tops in the recycling bin. At the recycling station, magnets will pick up the steel can, with the tops inside and drop them in a collection basket ready to be melted down and reused.