The Qi Lin is 14K gold plate with 925 silver. It may tarnish but wont rust.
This both bracelet ride on the Rooster metal fire energy and with a Qi Lin and some mantra to help peace a person mind and heart and bring in good energy.
Many experience flu this period is seasonal change and is ok. By next week all will be well.
For cough/flu remember to see TCM Dr Xu early or ur own TCM doctor as it can speed up recovery.