Stainless steel rings are resistant to tarnish, corrosion and rust. Rings made with stainless steel may be laser engraved. Stainless steel rings are extremely light - only titanium rings are lighter in weight. 
Stainless Steel is Hypoallergenic
Traditional jewelry metals, such as gold, silver, and even platinum, can elicit allergic reactions due to trace impurities in the metals or a person’s allergy to the metal itself. If you are someone who has skin allergies or sensitivities, then you may have had problems finding a ring that you are able to wear comfortably. Stainless steel rings are hypoallergenic and are much less likely to provoke allergic reactions than rings made from other metals