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．Tested to achieve 35000 RPM (using an 11.1V Li-Po battery, non-loading) ．Metal injection molding (MIM) steel enhanced extra strong pinion gear ．Smooth and powerful torque-up motor capable of pulling springs up to M150 ．PM steel motor shaft ball bearings stabilizer absorbs torsion forces generated during operation ．Built-in anti reversal current high durable diode precision built motor housing ．Enhanced copper brushes provide minimal resistance and high durability ．Efficient and smooth operation motor with high power saving efficiency ．Top rank ferrite magnets ensure consistent, high performance ．Folding steel forming even quality motor shell ．Windows on motor shell to enhance heat radiation ．Silicon steel rotor ．Made in Taiwan