What is the meaning of the ring, the brass, and the weak one in the hadith of 'Imran ibn Husayn?

Question:
May Allah reward you, Honorable Shaykh. This questioner says: In the hadith of 'Imran ibn Husayn (may Allah be pleased with them both), the Prophet (peace and blessings be upon him) saw a man with a ring of brass on his hand, so he said, "What is this?" He said, "It is from the weak iron." So what is the meaning of his saying "ring"? What is the meaning of his saying "of brass"? And what is the weak one?

Answer:
The ring is the round thing worn on the upper arm, so what is worn on the upper arm or on the forearm or on the leg, which is a round thing made of brass. Brass is a type of metal, a type of ore, yellow, its color is yellow, it is called gold, and it is a metal, an iron metal.
And the weak one is the fever, and this is from the severity. His saying (peace and blessings be upon him) to this man , "If you had worn it and it were on you, you would never have been cured."
And it is obligatory for the Muslim to seek treatment with the Shari'ah treatment, from ruqyah (healing by Qur'anic recitation) and from permissible medicines. As for superstitions and sorcery, these are not permissible for a person to use; because they are from shirk (associating partners with Allah) and relying on other than Allah (Mighty and Majestic).