DU is wall wrapped bearings made of triple layer composites materlal which consists of a steel backing,a sintered porous bronze partivles interlayer and calendared with PTFE and Pbmixture as surface layer.It is of low friction coefficient, anti-wear,anti-corrosion and low noise, compact and light.SF-1Xis widely applied in various sliding articles of different kind of machines such as textile zmachines, tobaccomachines,hydraulic vehicles,automobiles agriculmture and forests forests mahines and Soon.