304 Stainless steel jump rings. Closed but unsoldered. Stainless steel is harder to scratch and can withstand the sun, the sand and sea. Stainless steel has an extremely low rate of allergic reactions to the metal despite the steel still containing nickel.
8mm in diameter, 1.0mm thick(18 Gauge). about 6mm inner diameter
Jump rings have multiple uses with clasps, drops, dangles and jump ring bracelets.