HAPPYMT Fountain Pen Disposable Cartridges (5 pcs)

<HAPPYMT Fountain Pen Ink Filling Guide> All HAPPYMT fountain pens are designed for dual use with either "cartridges (disposable)" or "converters (reusable, requires separate ink purchase)." You can choose the accessories that best suit your needs. 【Cartridge】 This is the product set you are purchasing. It is disposable after use. Each cartridge comes pre-filled with ink. To use, insert the end with the ball into the pen nib, point the nib downwards, and wait approximately 3-5 minutes for the ink to flow. If the ink still doesn't flow smoothly after waiting, you can gently press the cartridge with your fingertip to accelerate ink flow towards the nib, or ensure the ball end of the cartridge is properly seated in the pen nib. 【Ink Converter】 This requires a separate purchase of fountain pen ink, much like a water bottle needs to be filled. Converters are reusable and can be used with a wide variety of commercially available inks, satisfying the desire of ink enthusiasts to explore different colors. However, please note that converter specifications can vary between different fountain pen brands, so be sure to confirm compatibility before purchasing. ■ Fountain pen ink can be purchased here :) https://www.pinkoi.com/store/happypenshop?tag=%E9%96%8B%E5%BF%83%E7%8E%A9%E5%A2%A8%E6%B0%B4&i18n_tag=%E9%96%8B%E5%BF%83%E7%8E%A9%E5%A2%A8%E6%B0%B4