Tenara LTR 69 Clear Light duty use: awning binding, pillows, light-weight cushions, curtains, etc. GORE TENARA Sewing Thread is manufactured from 100 percent expanded polytetrafluoroethylene (PTFE), the chemical name for Teflon from DuPont. Expanded PTFE is two to three times stronger than conventional PTFE. The TR STYLE is lubricated in all but the largest size. Give the customer peace of mind knowing they will not have to experience the inconvenience and loss of use to return an article for restitching.