Precisely define the contour of eyes, gently line lips or softly fill in sparse brows. IDUN Minerals Eye / Lip Definer Brush features lines of soft but sturdy bristles in a slender, angled shape. The thin, cylindrical handle ensures an easy sturdy grip allowing for small, meticulous strokes. Shape, fill in and define to perfection. Sturdy, slender, angled brush for accurate, precise application. The thin brush creates perfectly clean, defined lines.