1. Definitely has a supported feel, like aluminum foil backed
  2. 1/38" Thread
  3. Likely a Lurex (Japan) since a lot of my gray spools from the buy were labeled either Lurex or Japan
  4. Matches Kreinik 015 Chartreuse

As always I combine shipping. Don't worry if the system doesn't combine for you (sometimes it hiccups) I also check my orders for overage, and will correct it on shipping day.