APM ring

APM ring (Master Quality original product) accessories? (The items that come with it): if you order it without accessories, it comes: a black box without the brand logo, ____ if you order it with gift accessories: accessories: branded box, velvet pouch with the brand logo, accessories, velvet cloth with the brand logo. How do I care for it? I do not expose it to perfumes and chemicals. I do not expose it to water when washing and ablution. I do not expose it to humidity and keep it inside the box. The metal: stainless steel. What is stainless steel? Stainless steel (resistant to rust) what is stainless steel?