These are silly, but fun for homebrews. I get a lot of compliments on them and they're not much more than other lackluster caps. If I need to remember which beer is in which bottle, I just put a little letter code inside the beer glass on the bottle cap.I uploaded a picture of what the cap looks like when cold. It'll fade pretty quickly to white when left out, even though the beer is still cold. The coors "cold as the rockies" labels have the advantage of being in contact with a portion of the bottle that is in contact with the beer. The bottle caps are in contact with air on their largest surfaces, causing them to warm up much more quickly than the beer itself will.If you carbonate your homebrews heavily, these caps help insure that shared bottles don't get opened too warm and cause your precious beer to fountain out of the top.If using SanStar or similar to sanitize, only sanitize the ones you need for that day or they'll rust like crazy. I recommend laying them out in stacks of 4 and adding them to a bowl of SanStar solution 4 at a time while bottling, 2 minutes of contact time is all they need.These do cap tightly and fit standard bottles. They're oxygen barrier caps, not oxygen absorbing, so be sure this is the kind you want.I would recommend these caps to homebrewers looking to add a bit of novelty to your bottling process.I'll upload a picture of the bottle caps warm when I bottle my next batch.