This is a bonded nylon thread. Bonded means that is has a coating that increased durability, adds resistance to abrasion and fraying, adds a little stiffness, and makes it slightly thicker than it might be otherwise.

More or less equivalent to size AA – near as we can determine.

Tex size is the weight in grams of 1,000 meters of thread. So, if 1,000 meters of thread weighs 1 gram, then the Tex size is 1; if 1,000 meters weighs 30 grams, it is Tex 30, etc. So Tex relates to thickness, but is also influenced by the general heaviness of the type of material used.

500m on a spool.

Made in China. (Spool)