A while back I worked with Tombow on some Dual Brush Pen packs, exclusive to Michaels Stores. There is a Botanical Illustration, a Fashion Illustration, and a Watercolor Favorite
Tombow Bright Dual Brush Pens
Exclusive Tombow Dual Brush Pen Packs for Michael's — Brown Paper
Exclusive Tombow Dual Brush Pen Packs for Michael's — Brown
Tombow – Flax Pen to Paper
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Tombow Products - Pinnacle Colors
Tombow – Flax Pen to Paper
New Tombow Products, Tombow Dual Brush Pen
Wholesale Tombow Dual Brush Pens|Mechanical Pencil|Colored
Tombow 56197 Dual Brush Pen Art Markers, Desert Flora, 10-Pack
Exclusive Tombow Dual Brush Pen Packs for Michael's — Brown
Tombow Bright Dual Brush Pens