This is a kind of high strength cast bronze based material and on the surface of ehich is embedded with performed solid lubricant. So it can be made into bearing, plate, thrust Washer and soon. JDB has both the virtues of the copper alloy and the solid lubricant, can be applied under dry, high temperature, high pressure, corrosive, water of other chemical environments , where no oil can be introduced. This is now used in successive casting machines , steel rollers in metallography, mineral machines, ships and so on!