Abstract: A multi-element writing instrument adapted for use with wicking-type writing elements to operate as a multi-element, multi-color felt tip highlighting pen is disclosed. The instrument comprises 1) an elongated body, the body terminating with an opening and containing first and second separate lengthwise chambers therein, the first and second chambers containing first and second writing wicks, respectively, the wicks alternatively selectably extendable through the opening and 2) a structure for preventing fluids within the first and second wicks from commingling. In a preferred embodiment, the instrument provides a protrusion, mounted on the wicks proximate the writing ends, which prevents inks within the wicks from commingling by preventing the wicks from coming into contact with each other or with the body of the instrument.