Kosas perfected the Brow Pop in a Nano Ultra Fine Detailing Pencil. A longwear, ultra-precise 1 mm pencil for the tiniest hair-like details and a soft, clean, natural look. The perfect amount of pigment waxiness means it’s just firm enough for hair-like strokes that stay put.  Ideal for the smallest sparse patches, adding realistic details and dimension. Clean, vegan, hypoallergenic.