Pearl cotton, also known as "perle cotton", is a non-divisible 2-ply twisted thread with a subtle sheen. This material is a favorite for use in bead crochet, embroidery, knitting and more! Due to its softer hand, it will not twist or coil when used in a beaded chain stitch. We have found that size 9 hooks work well with this thread. Measurements: Size 8 (about 0.5mm thick). Quantity: You will receive one bobbin of 85 yards.