Silk yarns! I've always loved silk - not just its feel, but also the smell (a weaver-friend of mine says that is the smell of money!), the sheen (bombyx - tussah has a "flat" finish), the drape, its ability to take dye, and the wonderful "scrunch" when you squeeze it.
Listed are "bombyx" (cultivated) and "tussah" (wild) varieties. Bombyx is a creamy-white color and the "tussah" is in varying shades of sand to tan. "YPP" means yards per lb. (not per skein or cone).