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Amazon.com: RingSlinky: Ring Size Reducer | Ring Guard | Ring Size Adjuster. Size: 1.5 mm, for rings 1 mm to 2 mm wide. : Arts, Crafts & Sewing
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Amazon.co.jp: Shinjuku Gin no Kura, Width 0.1 inches (3 mm), Simple Round Instep, Slim, Silver, 925 Pair Rings, Sizes 5 to 21, Couple, Matching Set of 2, Engagement, Wedding, Metal, Men's Size
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