GXVE By Gwen Stefani Most Def Clean Instant Definition Sculpting Eyebrow Pencil Review @Gwen Stefani This brow pencil retails for $24.00 dollars. Described on the Sephora website as a clean brow pencil that fills, shapes, and sculpts brows for easy, instant definition. Its wide-angled, chisel-shaped tip keeps its shape as you use it, allowing for controlled sculpting and filling.