Polyester Thread 40/2 1.professional thread manufacturer 2.high quality,low price ... c) (40s/3): used for tailoring, trousers, jacket, medium, heavy fabric d) (20s/2), (20s/3): used for jeans, upholstery PVC ... , 2000y/3000y/5000y4) 30/2, 2000y/3000y/5000y5) 40/2, 3000y/5000y/10000y6) 40/3, 3000y/4000y/5000y7) 50/2, 3000y/5000y ...