| 摘要 |
An application device includes a stem and an application element on the stem. The application element includes a plurality of bristles. The plurality of bristles includes at least one first bristle having a counterclockwise helical profile over at least a portion of a length of the at least one first bristle and at least one second bristle having a clockwise helical profile over at least a portion of a length of the at least one second bristle. The plurality of bristles can include a plurality of first bristles having the counterclockwise helical profile and a plurality of second bristles having the clockwise helical profile. Also, the plurality of first bristles may have a plurality of different counterclockwise helical profiles, while the plurality of second bristles have a plurality of different clockwise helical profiles.
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