Grade A. Mulberry Silk, also known as Bombyx silk or Cultivated Silk. The best quality silk you can buy. It is produced from the silk worms of the Bombyx Mori Moth. Their diet consists of Mulberry leaves. Mulberry silk is produced in a controlled warm environment. With a long staple length of 4-6 inches and a fine micron count of 18 this fiber is treasured by advanced and beginner spinners alike. Suitable for use in blending, felting, and spinning projects. The lustrous qualities of the mulberry silk are enhanced with saturated and vibrant dyed colors to create unique yarns and blends with. This fiber has an incredible soft hand.