Direct-fill (DF) pens, also known as eyedropper pens, offer a unique writing experience. They hold significantly more ink than cartridge or converter pens, are usually waterproof and smudge-free, and can easily create precise markings on paper. However, before purchasing DF pens, especially in bulk, buyers often prefer to research various details, attributes, and features of this type of pen online. Unfortunately, online information is usually scattered, making the process tedious and time-consuming. To help buyers make the right choice, this blog compiles the most frequently asked questions about direct-fill pens . Know More : https://spartexpen.com/blog/10-most-frequently-asked-questions-about-direct-fill-pens/