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[Quiet Operation] Runs smoothly on small electric motors and robotics projects, reducing vibration noise in 3D printers and radio-controlled cars where bearing chatter would interfere with precision movement or ruin onboard microphone recordings. [Protection] Double metal shields on both sides block dust, fibre particles and metal shavings from entering the raceway, while keeping factory-applied grease inside the bearing so it continues spinning freely inside power tools and conveyor rollers. [Space-Saving Geometry] Outer ring measures only 4mm in width, allowing assembly into compact gearboxes, stepper motor housings and slim pulley systems where standard 5mm or 6mm thick bearings simply cannot fit between housing walls. [Precision Fit] Manufactured with an internal clearance of 10mm bore and 15mm outer diameter, delivering stable radial support for low-torque shafts in cooling fans, miniature pumps and electric screwdrivers without play or binding during high-speed rotation. [Multi-Project Value] A pack of ten identical bearings supplies enough units for building multiple small mechanisms, replacing worn parts in model trains, or keeping spare sets for future repairs on workshop equipment and benchtop lab .