American Crafts-Amy Tan Better Together Rub On Pens: XO's And Donuts. Easily add designs and fun patterns to any paper crafting project! This package contains two 4-1/4x1x1/2 inch rub on pens in two designs. WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. Do not mouth or chew. Imported.