Many makeup artists advise that it's best to apply blush only to apples of your cheeks. This "Cheek Guide" helps you figure out where the 'apple' of your cheek is. Place the "Cheek Guide" on your cheek, point the concave to your nose-wing, fix the alignment according to the vertical and horizontal lines. The circle part is where the apple of your cheeks is. Turn over the "Cheek Guide" to apply on the other side of your cheek.