Pros:
These labels are stretchable, have a cute design, and fits all the different bottles we have used. They are easy to write on, and the ink from the marker that accompanied it is fairly durable. The ink washes off quite easily with a paper towel and water. The ink has held up so far in the bottle warmers at daycare.
Con:
The marker began to dry after a few weeks of use. I expected it to last longer.

As soon as these labels arrived, I tested one to see if it held up to my expectation. The package came with an EXPO ultra fine tip dry erase marker.

The writing is very clear on the label. I rubbed the label with cloth and my hand to see if the writing was removed and it was not. I wet the label and rubbed the writing with my hand. The writing smeared a little but was still legible. When I attempted to wash the writing away, it did come off but left a light "ghost" of the writing behind. It wasnt bad though, you could write over it easily and it did not effect the new info. If it is bothersome, i used a little bit of hand sanitizer to clean the label and it was as good as new.

I got the SMALL blue labels. They fit my 4oz glass evenflo bottle. The evenflos are similar in size to dr. Brown. I have not used on my 4oz dr. Brown but i am confident that it will.

I bought 2 sets and on one the marker didn't work, the other set perfect.
You need to let dry very well so it doesn't smear. I filled the night before

Super tight on Mr Brown wide bottles and tight on Mr Brown narrow. Hard to write on.

Parent and Former Teacher simple and effective!