Our flagship conductive ink pen is now available in a 2 pack! Order pens as replacements to use in your Circuit Scribe kits . Draw on any surface a rollerball pen will write on. The Circuit Scribe conductive ink pen can draw 60-200 meters depending on writing surface and speed (60 meters on absorbent surfaces like a napkin, and 200+ meters on photo paper). Photo paper also has other benefits: you can erase ink by scratching a trace away, and you also get the highest conductivity on this surface ( Dimensions : 12 x 1 x 1 in Weight :050 lbs Product Code: CS-PEN-1ML-RETAIL