What qualifies
The offer applies to the specified two-piece set: one full-size Starstruck Black mascara and one full-size Infamous Brown mascara. It is not a discount on every mascara order.
The listed saving
The US page shows $49.30 for the duo against a $58 total value, described as 15% off. That is an $8.70 difference before tax or shipping.
Dates and exclusions
No fixed end date was stated in the inspected listing. Stock, shade substitutions, shipping and other promotions should be checked before ordering.
Keep the context
The image here shows a single mascara for identification. The offer is for the set described by the official source.