Valeria reviewed the Wing Eyeliner Pen & Stamp -2 pcs by KAJA in her video review. She mentioned that the product comes with both a stamp and an eyeliner pen. The stamp is designed for each eye, with a right and left one, which Valeria found super cute. She demonstrated how easy it is to use the stamp to create a perfect wing, saving time compared to applying a regular eyeliner. Valeria praised the product for its convenience, as the wing is usually the tricky part. Overall, she highly recommends the Wing Eyeliner Pen & Stamp -2 pcs by KAJA for its effectiveness and cute design.