The size details are listed below. This happens during the production process. The main reason is that the module is too small for stamping 925 or 990. What is Sterling Silver .
Sterling Silver Rectangle Wires, 925 Silver Flat Wires, Ring Blank, Cuff Blank, Bracelet Blank, Length 100mm, Width 2mm-12mm, Thick 1mm-2mm
0.4-1.2mm Real Pure Solid 925 Sterling Silver Wire Thread Silver String Line Filament Necklace Bracelet Earring Jewelry Making
10 Pairs 925 Sterling Silver Round Bezel Cup Ear Posts Concave Pad Stud Earring — Купить на PL (Польша) с Доставкой в Украину — Megazakaz
STERLING SILVER .925 Flat-Wire Split Ring Key Ring 28mm Made in USA Free US Ship $33.95 - PicClick
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5x7MM Rectangle Prong Ring Settings Blank Rose Gold Plated Solid 925 Sterling Silver DIY Bezel Tray for Gemstone 1294201
10 Pcs 925 Sterling Silver Round Stamping Blank Disc 24 Gauge 8mm Made in USA by Craft Wire
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50cm Solid 925 Sterling Silver Wire for DIY Bracelet Necklace Earring Fine Jewelry Making Findings&Components
925 Sterling Silver Wire Jewelry Making
Sterling Silver Flat Sheet Wires 925 Silver Slice Blank Thickness 0.1mm(38ga) to 1mm(18ga) - AliExpress
Fine Pure 999 Silver Wire (1.0mm (18GA) x 100cm (3.28 Foot)) : : Home & Kitchen