On the Rise Lash Booster by NYX Cosmetics.

It's hard to improve upon a good thing, but we've managed to do it with NYX Professional Makeup on The Rise Lash Booster. Created to boost the intensity of NYX on The Rise Volume Mascara for even bigger sky-high lashes, with boosted length and volume! It's also infused with castor oil for a conditioned feeling and the grey-black formula increases the intensity of black mascara and natural lashes, making it great to wear alone or under mascara for a big lash boost!

Pre-mascara:
Use before your favorite mascara to boost its lift, length, and volume potential.
Alone: For a naturally boosted, naturally tinted no makeup mascara look.

Pro tip: For sky-high volume and length, use On The Rise Lash Booster with NYX on The Rise Volume Mascara. Create a doll lash by applying coats of mascara from the root to the tip of your lash, focused on just the center of the top and bottom lashes.