The 308 Refillable Ink Cartridge Pack of 5 for Ahab/Neponset FP by Noodler's Ink
For your instruction, we would highly recommend viewing a YouTube video made by Noodler's Ink on how to use this ink cartridge system:
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As a certified retailer for Noodler's Ink® I am able to only list their products at their recommended MSRP or allowed discount. Other certified retailers of this manufacturer are given the exact same guidelines. Should you see prices under the MSRP, I would caution you as to whether or not you are receiving an item from a certified retailer of this manufacturer. Purchasing items from non-certified retailers may invalidated your guarantee. However, only the manufacturer can address that issue with certainly. Remember buying below MSRP may not actually represent a "savings".