They all seem to be of similar quality, and work OK, though not as convenient as a QR. I think I have a few left over but if I remember right the ends are purple.
Be aware that the new international postal rates from the USA are 20=60% higher than they used to be, with the biggest increase on smaller 1st class packages. 6oz. which used to cost $6.90 form the US to Oz is now over $12.00 (10.48 if done online).
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