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These are the best for envelope lettering, y'all!  They make the coolest double color shadow.

Sakura has developed the latest technology in the evolution of the ballpoint pen, a writing instrument that glides smoother than a ballpoint pen and doesn't bleed or blot through thin paper like ordinary ink pens or liquid rollerball pens. Dries permanent, water and fade proof. Extremely smooth writing, consistent ink flow to the very last drop.

These incredible pens write in metallic color and automatically create a brilliant colored border as you write with a 1.0mm ball for a 0.5mm line.