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https://www.likegro.com/products/stainless-steel-toilet-seat-hinge/

Stainless steel is an internationally recognized healthy material that can be implanted into the human body. It does not contain lead, is resistant to acid, alkali, corrosion, and does not release harmful substances. Therefore, the use of stainless steel toilet seat hinges can ensure human health and hygiene. The standard is also formulated based on the characteristics of stainless steel.

Stainless toilet seat hinges are the first choice for many ordinary soft close toilet seat fixings, because this toilet seat steel hinges have a very big advantage, no matter how long it is used, the appearance will not change, and it will not rust.

How Long Can Toilet Seat with Stainless Steel Fittings Last
Stainless steel toilet seat hinges are common household hinges, the biggest feature is that it will not rust. After a few years of use, it gets dirty and looks new with a clean rag. The copper hinge is beautiful, plastic, and decorative, it also has the function of killing bacteria in the tap water, but it may oxidize and affect its use after many years of use.