Your search for "acme ballpoint" revealed the following:
Ballpoint Pen Refills Glossary
The most common type of pen in the world today is a ballpoint pen. Easy-to-use with either a twist-action mechanism...
Refill Size Guide
Kindly note that refill pictures are for reference only and are not shown to scale. The main characteristics you are...
Multifunction Pen Refills Glossary
This toothpick-sized refill is common to mini or pocket sized pens and multi-function pens. The D-1 sized refill is typically...
Rollerball Pen Refills Glossary
Although the tips may look the same, a Rollerball Pen refill is quite different than a Ballpoint Pen refill. For...