Hetty,
I should have known you know about this. Can you post a picture of these. It is different that the ones we have. The ones I saw on line is not too good. I like to learn more about these. Are they really that much stronger and tougher that ours? Also I read on another forum about Round-up creating variegation in Sans. They were using this on them to get rid of. I wonder if some sections are variegated? Keep a keen eye out. Let us know.
Stush