Use with thin fabrics and leather, reinforcing tiny objects and fishing tackle. Average thickness: 0.15 mm (6/1000 In). Nominal tensile strength: 6 Lbs. Needle sizes: 70/10 to 80/12. No Medical Devices - Our Kevlar thread is clean in the ordinary sense. But, it is not sterile and using it in any medical device could put lives at risk. We will not knowingly sell Kevlar thread for use in medical devices.