Features:1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information;2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed.3.Made of bearing steel, model is MR128ZZ.4.Bearings have 8mm inner diameter, 12mm outer diameter, and 3.5mm thickness.5.Uses: toys, jewelry, decoration, ornaments, video card fans, power tools, etc.6.Total 10 pieces mini bearings which you may use for many different projects.Note: The bearing is tiny, please stay away from kids to avoid accidentally swallowing.Specifications:Model: MR128ZZMaterial: Bearing SteelColor: Titanium ColorSize: 8 x 12 x 3.5mm/0.31 x 0.47 x 0.14 inch(ID x OD x T)Weight: 12gPackage include:10 x Ball Bearings