A thin (cotton or polyester) thread is doubled, then twisted. It is then rolled over areas of unwanted hair, plucking the hair at the follicle level. There are a few different techniques for threading.
Eyebrow Threading 16 Spool Organica Organic 100% Cotton Thread Hair Remover FS
Eyebrow Threading 10 Spools Organica Organic Pure Cotton Thread Hair Remover
Eyebrow Threading 8 Spool Organica Organic Cotton 1 Boxes Thread Hair Remover
2 X Organica Organic Eyebrow Threading Thread Spools FAST S&H
Eyebrow Threading 8 Spool Box Organica Organic Pure Cotton Thread Hair Remove FS