The IM Custom Coloring Browcara, which is a brow mascara, comes with a unique applicator that's very similar to the PONY Effect one. The applicator has very short bristles on one side of the brush, while the other side has longer bristles.
The side with the shorter bristles is known as the 'Coloring Side' which is supposed to be used first and applied throughout the brow from the inner brow all the way to the tail. This lightly colors in your brow and gives it a fuller shape and overall look.
The side with the longer bristles is the 'Setting Side' which is meant to be used after the shorter bristles. Use the Setting Side to sculpt and shape your brows into place!