Due to the combination of material properties and properties, EU products have been widely used and popularized in general. Thin-walled structure, small volume, light weight, convenient to use the EU sleeve. Based on the material properties of the wear resistant layer PTFE mixture, the EU product is suitable for hard to maintain the hard or difficult to refuel, no oil lubrication and less oil lubrication. In the course of use, the PTFE mixture is formed by the transfer film to protect the grinding shaft and thus avoid the biting of the shaft. A mixture of PTFE has excellent wear resistance and low friction coefficient, and right amount of elastic plastic, capable of stress distribution in wide contact surface, thereby enhancing the EU products carrying capacity (see), so EU products for on a rotating, swaying, axial sliding and other occasions.