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high-end titanium steel, also known as titaniuml stainless steel.more expensive than ordinary stainless steel, it has passed hundreds of artificial sweat tests and does not lose its colour it has been tested by real people wearing it for long periods of time, in swimming, sweating, bathing, washing dishes and other liquid situations, without allergy how to protect the product: avoid wearing it while sleeping, avoid wearing it while playing, and avoid wearing it while bathing..syi