Bean Thread Noodles or Mung Bean Vermicelli (also known as glass noodles) are not made from a grain flour but from ground mung beans. Nowadays, however, many merchants offer inferior quality glass noodles made with flour not mung beans. We have the very best quality, original bean thread from Thailand "Kaset" brand, made from the best green mung beans and all natural. Once the noodles are soaked they become soft and slippery, springy and translucent. Variously called "silver bean thread noodle" or "Woon Sen", they're flavorless and take on the taste of their accompanying sauce or broth. They should be soaked in warm water for about 7 minutes before use.