Asvine 5 Pack Fountain Pen Ink Syringe Filler, Spring Converter with Removable Blunt Needle Tip

The Asvine 5 Pack Fountain Pen Ink syringes are cheap, work for any converter from any fountain pen, and are perfect for refilling used disposable cartridges, but can be messy to use. A spring inside the converter ensures ink flows. They can be used for dispensing machine oil and are detachable. However, the pieces are cheaply pressed together and can come apart causing mess. Some pieces stay together better than others. The white plastic adapter is difficult to get seated. The spring is too stiff making it difficult to fill with one hand. And while the adapter and blunt needle can be used with your own international converters, the converters that come with are proprietary to Hongdian.