Jack Hammer
Contributor
I bought a roll of the fancy GUE contents stickers 5 years ago because I like the layout. Still have a lot left, the roll has way more than it looks like on it. I think they're really nice and considering how many it comes with, worth the price.
As to MOD, all my cylinders are permanently marked. This is simpler if one uses "standard" mixes. I also find it becomes more important when your diving frequently involves multiple cylinders. MOD stickers are pretty inexpensive. If I have to temporarily repurpose a cylinder for something other than its marked MOD I just put blue tape or duck tape over all the MOD markings, not just the outer one, clearly marked with a magic marker.
As to MOD, all my cylinders are permanently marked. This is simpler if one uses "standard" mixes. I also find it becomes more important when your diving frequently involves multiple cylinders. MOD stickers are pretty inexpensive. If I have to temporarily repurpose a cylinder for something other than its marked MOD I just put blue tape or duck tape over all the MOD markings, not just the outer one, clearly marked with a magic marker.