SO WHAT ARE THEY FOR?
These are gas can ID tags for the cans that contain mixed fuel (the kind needed for weed eaters, chainsaws, leaf blowers, etc.).
Often guys write 40:1 or 50:1 in black Sharpie on their cans, but that fades and is tough to see from a distance. And if you accidentally put mixed gas in the wrong equipment, you destroy the equipment so it's a big deal!
Grab one of each for your men and they'll be super stoked!