Abstract: An improve mascara brush has a typical twisted wire core containing bristles having a double lumen cross-section. The bristles are generally circular in shape, and hollow, with a dividing web across the midpoint of the bristle, thereby defining two longitudinal lumens extending along the length of the bristle. In other embodiments, the bristle is oval, square, rectangular or another polygonal shape.

Abstract: An improved mascara brush has a typical twisted wire core containing bristles having a high durometer and relatively large diameter. The bristle density is in the range of 8 to 20 bristles per turn; more preferably 10-15 bristles per turn, and most preferably 12-14 bristles per turn. The bristles have a diameter of from 0.010 inch to about 0.016 inch, preferably 0.011 inch to 0.014 inch, and most preferably 0.011 or 0.012 inch. The bristle durometer is in the range of about 92 Shore D hardness to 120 Rockwell R; more preferably about 100 to 120 Rockwell R; most preferably about 103 to 108 Rockwell R. In one preferred embodiment, the filaments have a durometer of 108 Rockwell R. The brush is stable and effective for rapid lengthening of eyelashes and combing of the eyelashes.