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[Material] It is made of bearing steel, which is not easy to wear and . It is a great replacement for your product.
Specifications: Model: MR104ZZ Material: Bearing Steel Color: Titanium Color Brand name: CNBTR Size: 4 x 10 x 4mm/0.16 x 0.39 x 0.16"(ID x OD x T) Weight: 17g Features: 1.Dimensions: 4mm inner diameter, 10mm outer diameter, 4mm thickness. 2.Uses: jewelry, decoration, ornaments, video card fans, power tools, etc. 3.Material: bearing steel, not easy to wear, more durable. 4.Package includes 10 pieces ball bearings. Package Content: 10 x Ball Bearings The unique MPN label on each inner package, which confirm it passed the quality inspection and it is genuine item sold from our shop. Please offer it to us when you need assistance. If you have any question about the product, feel free to contact the CNBTR Service and we will try our best to give you a satisfactory answer.