The Nulastin Brow Shape Altering Serum is a 0.1 fl oz (3mL) eyebrow serum designed to help shape and enhance the appearance of eyebrows. This unscented serum from the trusted brand Nulastin is specifically formulated to promote a natural looking brow shape and improve the overall health of your eyebrows. With a long period after opening of 24 months, this serum is ideal for achieving a more defined and shaped eyebrow look.