D'Addario seem to have more than their fair share of problems.
I had a seven string guitar built for me many years ago. At the time It was hard to find string sets of seven. I found out that D'Addario did them in chrome flatwounds. I purchased three sets over the internet from a supplier in the UK.
When they arrive they had seven string marked on the packaging but there were six string sets inside. Needless to day I was somewhat annoyed.
I emailed D'Addario direct and complained. They said that they had some quality control problems at the time.
It would seem that they still have
The strings when they finally did arrive as full sets turned out to be pretty good on the guitar I have to say
Hugh.