Our nylon sewing thread is made of high quality nylon yarn. Strengh, color fastness, denier deviation and tenacity can meet national standards. They are also lubricated with a special oil to reduce static and friction when used on high speed machines. And they are free of the azo dye stuff. Indeed, the threads are dyed in more than 200 colors at the customer's choice. Specifications:210d/2(40#),210d/3(30#),210d/4(20#),420d/3(10#),630d/3(5#0,840d/3(0#) Packing: 50grams---1000grams per king spool