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 send, 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) and make your judgment. Disassembly, gluing, and other work may be required for installation. We cannot provide compensation for damage or defects associated with 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 incompatibility, are not accepted. If you suspect an initial defect, please contact us within 3 days of receipt. If you purchase multiple sets, we will offer a discount on the shipping cost and create a dedicated listing. Shipping Method: Yu-Packet Mini (planned)