Tex system is based on the weight in grams of a thread 1 kilometer long. A kilometer of tex 10 (very fine) thread weighs 10 grams, while a kilometer of tex 100 (very coarse) weighs 100 grams. The Tex system measures the entire thread, no matter how many strands or plies it has. While a thread can have any actual weight, the Tex system has official ranges of sizes that get the same Tex number. For example, all threads weighing between 24.0 and 26.9 grams per kilometer are designated T-24. This is on the link. Sorry it didn't link but you can Google that logo then thread systems. Hope that works for you.