Steel rings
The same rings filtered by material: 316L steel only. 5 models in stock.
Why filter by metal
Because the metal decides whether the ring can stay on: 316L does not rust from water or sweat.
Nickel
316L steel is surgical stainless steel: it does not rust or tarnish. It is not nickel-free, though — the nickel is bound in the alloy and barely releases. With a known nickel allergy, choose titanium.