Teflon Impregnated Bronze Bearings are among the highest performing plain bearings available. The porous bronze inner structure acts as a reservoir for the very low friction Teflon lubricant. The lubricant film transfers to the mating surface. As the film is depleted, the relative motion draws further lubricant from the bronze layer. When load or speed are significant, localized heat is generated and additional lubricant is forced to the surface. The bronze inner structure is bonded to a steel backing, giving a high load carrying capability and dimensional rigidity.