This colorless solvent based blender pen creates amazing watercolor effects with artist colored pencils. Blend, unify and soften pencil strokes as you please. Experiment with the effects of the two different tips - a bold tip on one end and a fine tip on the other. Details: Colorless blender Dual tip (bold and fine) 12 packs (3 pens per pack, 36 total pens) Acid-free Low-odor Non-bleeding and fast-drying