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1.Each qualify checked item with a unique Manufacturing Part Number label on the inner package to confirm if it is the authentic item sold from our store. 2.When you have any problems about your item ,please send us the MPN label information first 3.Made of 45# steel with high wear-resistance. 4.0.5 Modulus, 25 teeth, 6mm hole diameter. 5.Widely used in rc models DIY, microgenerator, small machinery, mechanical transmission, ect. Specification: Material: 45# Steel Teeth: 25 Modulus: 0.5 Bore: 6mm Brand name: Mxfans Overall Size: 13.5 x 10mm/0.53 x 0.39 inch(Dia x H) Weight: 6g Package Include: 1 x Motor Pinion Gear