Thread size? I was going to say the same thing cody, i went years using all the other brands, moved over to E3 in south florida a year and a half ago. They introduced me to Serafil thread and oh man. what a game changer. Maybe not so much for UV thread, they do have a version of this for custom tops and such, which i just started dabbling with, but ill take their color fastness and choices over anything else ive used before. Thier 15 thread is definitely thicker, and closer to the 92 we are all familiar with. Thats what we use as our standard size, works awesome for top stitching and for general purposes. Sews well in my consew 206, bobbins run out quick, but its worth it. I switch up to the 10 for steering wheels to get it even fatter. Their 30 is close to the standard 69 but a little less available color wise.