The EZIP Pen Point Marker is used to mark a point or region of interest during SPECT studies. The Pen Point Marker contains Co-57 in a resin matrix at the end of a 5.4” (13.7 cm) anodized aluminum rod. The pen-shaped rod screws into a brass cap which shields the active point. The Pen Point Marker is used in tracing the outlines of anatomical features on a patient. The trace appears almost instantly on the image display. Contained activity is supplied as a nominal value +/-15%.