Earlier, I'd found a good shroud line thread before HERE. This was a 76% polyester, 24% cotton blend.
Recently, I found this at a JoAnne's Fabric in Orlando Florida.
It's the closest thing to the old style Estes/Centuri shroud line material.
I've always searched in the general thread section for better shroud line string, not in the embroidery section of a craft store where I found this.
It's strong, the right diameter for LPR and 100% cotton.
It's manufactured in France by the DMC company. It's designation is: DMC Pearl Cotton Balls, #12, #219659.
In the same section, larger spools of 100% cotton string were available in size 10. The size 10 is slightly thicker. There wasn't any larger spools of the Size 12 cotton string.
From the DMC website:
* Size 12 (Art. 116/12) is available on a 131 yard ball in 40 solid colors.
It was $2.79 for 131 yards or 393 feet.
Do the math and it comes out to $.007 a foot, less than a penny a foot!
Some rocket vendors charge from $.04 to $.15 a foot for shroud line.