Sacs sizes are given as the diameter measured in n/64ths of an inch. Sizing a pen involves measurement of the sac nipple on the section in n/64ths of an inch. This is a starting point, judge sac size based on how it slides in the barrel.
COVID-19 Announcement - At this time we are still accepting orders and shipping them out. In order to reduce exposure at the post office we are increasing our processing time to 1 week. The COVID-19 virus is a dynamic and rapidly evolving global situation. We are monitoring the situation and will follow advice and guidelines from health officials, stay safe and healthy out there.