Abstract: Provided is a method of improving skin condition by applying to the skin of a subject a cosmetic composition comprising black yeast-derived exosomes as an active ingredient and thereby improving the skin condition, particularly skin elasticity improvement, skin wrinkle reduction, skin texture improvement, skin tone improvement, skin brightness improvement, skin regeneration, skin moisturization, and/or whitening.

Abstract: Disclosed is a reverse synchronizer mechanism for a manual transmission of a vehicle including a reverse idle drive gear rotatably mounted on a reverse idle shaft and engaging with an input first speed gear, which is integrally formed around an input shaft, to rotate therewith; a reverse idle driven gear integrally mounted on the reverse idle shaft; a reverse output gear mounted on an output shaft and engaging with the reverse idle driven gear so as to rotate therewith; and a synchronizing mechanism, which is provided between the reverse idle drive gear and the reverse idle driven gear, for synchronizing and transmitting power of the reverse idle drive gear to the reverse idle driven gear. Both the reverse idle drive gear and the reverse idle driven gear are made of helical gears.