I googled around and am not having any luck finding this, but I did find a few references to it.
- User "windstar" in this posting says they purchased theirs at Wal-Mart (
https://www.designsbysick.com/forums...hp/t-7551.html). However, this was 9 years ago - in 2009.
- I then searched the Wal-Mart site, but it's not listed there.
- This shop in the UK has it listed, but out of stock:
https://www.emeraldcrafts.co.uk/stit...ible-thread.ir
My gut feeling is that it's no longer made, or has been sold to another company.
So then I found this, which gives comparisons of invisible threads. Maybe one of these would work for your machine instead?
http://www.quiltersreview.com/six-in...t-to-the-test/