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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 al its own characteristics: high hardness, corrosion resistance, strong acid resistance, alkaline resistance, no discolouration, no fading, no allergies. 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.syi