Clover 3158 elastic yarn thread( black )is great for adding or knitting into your favorite projects such as socks, cuffs, collars and sweater ribbing to maintain original shape. Knit or crochet simultaneously with elastic yarn thread. It dispenses from the package. It is 98 yards in length relaxed and 197 yards stretched. This item also comes in white (opaque) see clover item no.13152.