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【Standard Dimension Design】This 3ml pen cartridge features uniform sizing with a 3ml capacity, delivering precise dimensions for smooth installation. The 20‑pack provides ample supply for routine use. 【Tight Sealing Structure】This pen cartridge bottle is built with fine stoppers and aluminum tops to form a secure closed system. It effectively prevents liquid overflow and maintains stable performance. 【Individual Packaging】This peptide pen cartridge comes individually sealed to keep out external dirt and debris, ensuring each piece stays clean until you open it while compact size also makes it easy to carry. 【Broad Compatibility】This refillable insulin pen cartridge fits a wide range of pen series, allowing quick assembly and flexible combination. It adapts seamlessly to different user preferences, making it a versatile choice. 【Durable Construction】This reusable insulin pen cartridge is crafted from solid glass with refined workmanship, offering excellent resistance to wear. The sturdy build supports repeated refilling, ensuring long‑term dependability.