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Here is a breakdown of the product based on the details you provided:

feature	describe
Finger circumference (inner diameter)	17-18 mm (opening can be fine-tuned)
weight	About 5-6 grams
material	copper
process	Color retention electroplating three layers of 18K thick gold
feature	No fading, no rust, anti-allergic; can be worn daily, no need to take it off for hand washing and bathing