Thread Weight
I was unfamiliar with thread weight, so I Googled it. I'm probably the only member here that didn't know what 60 weight meant in terms of quilting, but I thought I'd share what I found out. I mostly use coats & clark, but now I know to pay attention. It's 30 weight!
"The weight of a thread is actually a length measurement. Dividing the length of thread by a set weight derives the exact measurement of a thread weight. A thread is labeled 40 wt. when 40 kilometers of that thread weighs 1 kilogram."