This twist converter allows you to use bottled fountain pen ink with your pen. Sailor converters only work with sailor fountain pens. This will work with any U.S. released sailor pen, besides the Professional Gear Slim Mini which has to use their mini converter. 

To use simply attach to the front nib section of your pen. Grab a tissue or paper towel for easy clean up. Dip the nib so it is completely submerged and twist all the way down and all the way back up. Then wipe off any excess ink that is on top of the nib or on the grip section. Your converter should be about 75% ink and a 25% vacuum/air at the top.