Pentel Arts DuoPoint Flex Double-Ended Brush, Black Ink, 1-Pk — Pentel of America, Ltd.
Amazon.com : Dual Tip Brush Pens Double Sided Pigment Based(Non Acrylic) Brush Markers 36 Color Art Set with Zipper Case Flexible Brush and 0.4mm Fineliner - Coloring Journaling Lettering Drawing Sketching :