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Package Contents - 10 Pack MR149ZZ (9x14x4.5mm), Suitable for assembly on micro-shafts and in confined spaces 100Cr6 chrome steel - High wear resistance and high load capacity Double-sided metal seals - ideal for clean, dry, high-speed applications Pre-lubricated with grease - Ready to install right out of the box, with virtually no maintenance required under normal conditions Commonly used in DIY, toys, remote control, 3D printers, curtains, instruments, power tools, household appliances and office equipment, etc.