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Description: Miniature ball bearings are available ball bearings of quite small size. These miniature ball bearings have a 5mm inner diameter, a 11mm outer diameter, and a 4mm thickness. Ball bearings of this size are ideal for precision work and applications that require a lot of functional mechanical parts in a small space, such as 3D printer, quadcopter or model. Specifications: Material: Bearing Steel Model: MR115-2RS Color: As the picture show Size: Approx.5×11×4mm(ID×OD×H) Weight: 16g Quantity: 10pcs Notice: Please allow 1-3mm error due to manual measurement,Please make sure you do not mind before you bid. Package Included: 10 × Bearings