From the manufacturer:
Satin Floss is a divisible, 6-strand, 100% rayon thread. This shiny, lustrous thread can be used by cross stitchers and embroiderers for basic and advanced stitches. Perfect as an accent to other threads like DMC embroidery floss. Colorfast, washable and dry cleanable.
This set includes 1 skein each of S321, S552, S602, S700, S741, S820, S995 and S3820 plus a variety of bonus cross stitch and embroidery designs. Color S741 is available only in this collector pack and NOT available in open stock.