"Yin" is a brand of knives with Miao ethnic characteristics, which was founded in 1829. The forging technique of knives has been passed down for thousands of years and is persistently adhered to by two blacksmith brothers, Aji and Ada. They have been studying it since childhood and have been searching for high-quality raw materials everywhere during their growth.

The word "Yin" implies both mysterious concealment and restrained yet powerful strength. The brand is extremely strict in the selection of materials, which are sourced from the mineral veins deep in the mountains. The knives are forged according to the ancient method and integrate the Miao ethnic culture and art into the body of the knives, making them uniquely charming.