These brushable pens are two ended, with each end having variations of the same color. They are photo safe, acid free, water-based pigmented inks.,
ZIG Memory System Brushables 144-Pen Assortment Display
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Zig Brushables
Kuretake ZIG Brushable Butter
Kuretake-ZIG Brushables Double-Ended Marker — ArtSnacks
Kuretake ZIG Brushables 502 Butter
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Kuretake ZIG Brushables Brush Pen
Kuretake dual-ended brush pens are super handy because they give you two tones of the same color! Brushables are acid-free, archival quality,
Kuretake Brushables
Zig Brushables 24 Set
Kuretake Zig BRUSHABLES 6 Vivid Colors Set, Two-Toned Pen, Twin Brush Tips, Waterproof When Dry, No Mess, Photo-Safe, Acid Free, Lightfast, Odourless, Xylene Freeing, Archival Quality, Made in Japan
New Zig Kuretake Memory System Brushable Twin Tip Brush Pen Set of 12 Pens