{"product_id":"50pcs-universal-fountain-pen-ink-sac-cartridges-easy-refill","title":"50pcs Universal Fountain Pen Ink Sac Cartridges Easy Refill","description":"\n\u003ch2\u003e50-Pack Universal Fountain Pen Ink Sac Cartridges – Smooth, Easy Refill for Students \u0026amp; Professionals\u003c\/h2\u003e\n\n\u003cp\u003eKeep your fountain pen flowing effortlessly with this \u003cstrong\u003e50-piece set of universal ink sac cartridges\u003c\/strong\u003e. Engineered from high-quality, durable plastic, each ink absorber features an ergonomic plunger-driven design that lets you refill with liquid ink neatly, quickly, and without mess. Whether you're a student, calligrapher, or office professional, these universal sacs are compatible with a wide range of standard fountain pens — making ink refilling simpler than ever.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Choose These Ink Sac Cartridges?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUniversal Compatibility:\u003c\/strong\u003e Designed to fit most standard fountain pens, eliminating the hassle of hunting for brand-specific refills.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSmooth Ink Flow:\u003c\/strong\u003e Delivers consistent, confident lines every time — perfect for everyday writing, note-taking, and creative projects.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eErgonomic Plunger Design:\u003c\/strong\u003e Simple to install and operate; just press, fill, and write. No leaks, no fuss.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Plastic Construction:\u003c\/strong\u003e Built to withstand repeated use without deforming, ensuring a long-lasting refill experience.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWorks with Erasable Ink:\u003c\/strong\u003e Fully compatible with color erasable inks — great for students who need flexibility in their writing.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGenerous 50-Piece Pack:\u003c\/strong\u003e Stock up and never run out of ink mid-task. Ideal for classrooms, offices, and creative studios.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Portable:\u003c\/strong\u003e Each sac measures just 5.00 × 0.60 × 0.60 cm (1.97 × 0.24 × 0.24 in) — lightweight and easy to store.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eProduct Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHigh-Quality Plastic\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize (each)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5.00 × 0.60 × 0.60 cm \/ 1.97 × 0.24 × 0.24 in\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eQuantity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e50 pcs per set\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatibility\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUniversal (most standard fountain pens)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInk Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUniversal \/ Erasable Liquid Ink\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Set of 50pcs Fountain Pen Ink Sac Cartridges\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePerfect For\u003c\/h3\u003e\n\u003cp\u003eStudents, writers, calligraphers, office professionals, and fountain pen enthusiasts who want a reliable, mess-free, and cost-effective way to refill their favorite pens. Works seamlessly with standard and erasable inks.\u003c\/p\u003e\n\n\u003ch3\u003eExplore More DIY \u0026amp; Craft Supplies\u003c\/h3\u003e\n\u003cp\u003eLove crafting and stationery? Check out our other popular picks:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/multicolor-pompom-plush-fur-ball-beads-diy-jewelry-charms\"\u003e10pcs Multicolor Pompom Plush Fur Ball Beads – DIY Jewelry Charms\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/stainless-steel-cord-end-caps-with-loop-jewelry-making-6pcs\"\u003eStainless Steel Cord End Caps with Loop – 6pcs Jewelry Findings\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/50-candy-color-duckbill-hair-clips-50-pack-wave-barrettes\"\u003e50-Pack Candy Color Duckbill Hair Clips – Wave Barrettes\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/hand-power-tools\" target=\"_blank\" rel=\"noopener\"\u003eOSHA guidance on hand and power tools\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Are these fountain pen ink sac cartridges compatible with all fountain pen brands?\u003c\/h4\u003e\n\u003cp\u003eA: These ink sac cartridges are designed to be universal and compatible with most standard fountain pens. However, compatibility may vary with some specialty or proprietary pen models. We recommend checking your pen's refill specifications before purchasing.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I use erasable ink with these fountain pen ink absorbers?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! These universal ink sacs are fully compatible with color erasable inks as well as standard liquid fountain pen inks, making them a versatile choice for students and creative writers who prefer erasable options.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How do I refill the ink sac cartridge?\u003c\/h4\u003e\n\u003cp\u003eA: Simply insert the ink sac into your fountain pen, dip the nib into your ink bottle, and use the ergonomic plunger mechanism to draw ink up into the sac. The process is quick, clean, and easy — even for first-time fountain pen users.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How many ink sac cartridges come in this pack?\u003c\/h4\u003e\n\u003cp\u003eA: Each set includes 50 individual fountain pen ink sac cartridges, giving you a generous supply for extended use at home, school, or the office.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Are these fountain pen ink sac cartridges compatible with all fountain pen brands?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"These ink sac cartridges are designed to be universal and compatible with most standard fountain pens. However, compatibility may vary with some specialty or proprietary pen models. We recommend checking your pen's refill specifications before purchasing.\"}}, {\"@type\": \"Question\", \"name\": \"Can I use erasable ink with these fountain pen ink absorbers?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes! 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