Ink sacs for repairing and restoring lever filler (sac type) fountain pens. Use these to replace sacs that have hardened and cracked due to aging. Quantity: 6 Material: Silicone Size: Total Length: Approximately 56mm Outer Diameter: Approximately 5.5mm *Please note that there may be slight variations due to amateur measurements. Condition: 【Unused / Stored Item / Used (Removed Item)】. There may be some dust accumulation due to storage. Please check the condition based on the photos. Since we will select 6 pieces from our stock to provide, the condition may vary. Accessories: Body only Notes: Fit is most important based on size. Please measure the outer diameter and length of your fountain pen (or the sac you are replacing) before making your decision. Installation may require disassembly and gluing. We cannot provide compensation for damage or defects that occur during the work. If you are not familiar with repairs, please consider having a specialist perform the work. Due to the nature of the parts, returns and exchanges, including those due to incorrect fit, are not accepted. If you suspect an initial defect, please contact us within 3 days of receipt. If you purchase multiple sets, we will create a dedicated listing with a discount for the shipping cost. Shipping Method: Yu-Packet Mini (planned)