Our overfeed is a device that sits on top of a flexible nib and helps you draw wider lines for a longer period of time. The overfeed stores ink on top of the nib, then feeds that ink to the tip of the flexible nib when it lifts off the paper and no longer receives ink from the underfeed. Your pen must be configured for an overfeed if you want to use an overfeed. You cannot slip an overfeed into a pen that hasn't been configured correctly. Our overfeed works for nibs that have a topside reservoir, such as Brause Bandzug nibs, however, you must remove the topside reservoir for the nib to fit. You can replace the overfeed with an overfeed collar when you don't want to use the overfeed. One product photo shows three overfeed collars from various angles. They are simple tubes that reduce the inside diameter of the front pens configured for overfeeds to the original size. Another photo shows two Classic Pump Pens configured for overfeeds where one pen contains an overfeed collar while the other just contains the collar. You can see the collar lip protrude from the pen. Another product photo on this page shows three overfeeds in different positions. You only get one overfeed when you order an overfeed. The other two are included to show all aspects of our overfeeds. Nibs you can use with our overfeeds Brause Rose nibs Manga G nibs by Nikko, Tachikawa and Zebra Our Sketch and Music nibs Other nibs with a similar size and shape For more info . . Overfeed collar Using our overfeeds