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This pen uses a 3.4MM caliber ink sac. If you want to purchase an ink sac separately, please purchase a 3.4MM caliber ink sac.
Before using the new pen, please wash the fountain pen with warm water of about 50 degrees. Because the nib may stick to oil stains or stains during the manufacturing process, it will affect the use of ink.The 3.4mm caliber ink sac used by the fountain pen. If you are not an ink bag of this size, please buy the ink bag in the link, or buy this product carefully.
