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1:Our product is by the metal powder is the primary data, the brave powder metallurgy law manufacture's sintered body, itself is the porous system, and has in the process of manufacture may teach to adjust distributions freely and so on quantity size shape, has the cost to be low, can attract inspires, the noise is small, does not use characteristics and so on apply oil in the long operating time, adapts specially in is not easy to lubricate or not to permit the oil sully the working conditions 2:Thesize andmaterialcanas customers required 3:About the packing we usually do customersrequired