Flat Top Carter's Pens - From top to bottom these are a thin standard jade green, standard size red & black, standard size lacquer red, and over size red & black hard rubber. These pens are also found in black and a blue model as well as the pearltex pens that have an iridescent appearance. The model number is stamped on the bottom of the pen barrel. It is a help that the number in the ones place is the nib size. The bottom pen is a 4117 meaning that it is the oversize model with a #7 nib.