Amazon.com : MONAMI Color Twin Brush Dual Brush Pen Double Tipped Fine & Medium Marker for Coloring Book/Calligraphy/Lettering/Illustrations, Flower 6-Pack (Yellow,Pale Orange,Baby Pink,Pink,Orange,Red) : Arts, Crafts & Sewing
Amazon.com: Dual Brush Pens Art Markers, Shuttle Art 56 Colors Dual Tip Calligraphy Pens Fineliner and Brush Tip perfect for Kids Adult Artist, Hand Lettering, Journal, Doodling, Writing, Coloring Books. : Arts,
In my toolbox: A review of five brush calligraphy pens | Pieces Calligraphy