Three coins which are strung together on a red strings is a symbolism of a magnet for wealth luck.
For many centuries, Chinese coins have been a very desirable symbol, signifying prosperity and owning many riches. The coins from the Ching Dynasty, the most powerful dynasty in Chinese history, are the most highly valued. Coins used during the reign of the emperors Kang Ksi or Chien Long are also highly revered, and said to be more auspicious than others. The coins were also used to protect these emperors from any bad intents by others, and so are today used as amulets against harm.
Keep the Three Brass coins in your wallet or handbag, and carry them with you on all outings. This is said to keep wealth energy constantly beside you, always opening up new opportunities.