Disclosed is a concept of a synthetic fiber substitute for pony hair, for use in cosmetic brushes or the like, made of PBT, with a mix of two diameters of fibers, 0.05 mm diameter and 0.07 mm diameter, with the ratio of the blend being 8:2 (8 parts 0.05 mm diameter and 2 parts 0.07 mm diameter). The tips used on both types of fibers is a "short tip", and the wave characteristic of both types of fibers is "small wave".
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