The wintertime polar vortex is a unique atmospheric region which contains old air that descends from high altitudes. The processes controlling aerosol properties there and the stratospheric importance of aerosols formed there are not well known. We measured the size-resolved composition of particles in and near the polar vortex in the lower stratosphere air during NOAA's SABRE mission flights out of Alaska in February-March 2023 using PALMS-NG, the Particle Analysis by Laser Mass Spectrometry-Next Generation instrument. Particles found in the vortex overwhelmingly consist of sulfuric acid with meteoric metal inclusions, and they are significantly smaller than the background stratospheric aerosol. These particles contain extremely low mass fractions of organic molecules. The fates of such particles in the stratosphere will be discussed.