The present invention relates to filled polymeric compositions, such as filled TPO compositions, having improved aesthetics, and to polymeric masterbatches which may be used to prepare the improved filled TPO compositions. A tip section distal the catheter body includes an irrigated tip electrode and a segment of flexible tubing with at least one lumen therethrough. Methods of micropolishing a surface of a non-ferrous metal workpiece including exposing the surface to a bath of an aqueous electrolyte solution including a concentration of citric acid in the range of about 1. The controllers are separately located from a data processing center of the telemetry system such that the controllers alleviate data congestion going to and coming from the data processing center.