All thread has a tex weight but usually not sold that way in shops. All are listed as weight. 50 weight being the go to weight for piecing. Each weight has a tex number but seems not all are the same. Confusing. Wawak is a professional sewing supplier. The site is secure. I have ordered zippers, seam rippers, snips, etc for years. I did call but the person I talked to only knew about heavy duty sewing. Didn't know about thread like Superior, Wonderfil, Aurifil to compare.