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These probes for STM imaging are made of tungsten wire and are electrochemically etched (except for part "STM" which is mechanically-formed) to produce a tip with more uniform geometry than Platinum-Iridium tips.  These probes are recommended for scanning areas larger than atomic scale.  They come vacuum packaged to prevent oxidation -- once opened, these tips should be used in approximately one week since oxidation may degrade performance.