Replaceable Straight Liquid Pen Ink Sac $ 4.79 Product Information: Type: Heat sensitive steel pen and ink sac Specification: Single about 50*8mm Packing material: Plastic Color: crystal blue, ink blue, black Features: It is suitable for standard caliber 3.4mm straight liquid fountain pen with standard interface ink sac, which is convenient and hygienic to carry Packing list: Ink sac X15PCS
