Those who love hand embroidery and goldwork, these are Imitation Japanese Gold threads available in sizes No. 13, No. 12, No. 9, and No. 8 which are also known as K1, K2, K3, and K4. The gold threads are used in pairs. The gold threads are often worked on a padded surface such as felt padding. They may also be used as a finishing edge around an embroidered applique. The gold foil has a lovely burnished color that looks fiery – gold in a finished project.