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: 5 Material: Silicone Size: Total Length: Approximately 45mm 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 confirm the condition primarily through the photos. As we will select 5 pieces from our stock to send, the condition may vary. Accessories: Body only Notes: Size is the most important factor for compatibility. Please measure the outer diameter and length of your fountain pen (or the sac you are replacing) to determine suitability. Installation may require disassembly and gluing. We cannot provide compensation for any damage or defects that may occur during the work. If you are not familiar with repairs, please consider having a professional do 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)