The Black Opal Even True Conceal & Brighten Under Eye Concealer is formulated to help conceal and brighten the under eye area. The metal rollerball applicator is supposed to aid in depuffing and refreshing the eye area. The formula is very lightweight and oil free, hypoallergenic, paraben-free and fragrance-free. To use the concealer you press down on the rollor ball, gently squeeze out the concealer and roll it under your eye to conceal dark circles, fine lines and wrinkles. It comes in 6 shades, I decided on the shade Tan since the next deepest shade seemed to be an exact match for my skin tone and I wanted a shade lighter to aid in brightening my under eye area.