Features: 1.VALUE PACKAGE. 1 pack of 10 pieces ink sac, assorted colors, 3.4 mm bore diameter for most fountain pens. for Ideal for DIY planner, DIY scrapbook, sketching, drawing, diary, etc. 2.UNIVERSAL INK SAC. Refill Ink. Length is about 2.68in; 10 kinds of ink color for you to choose, including black, blue, red, black blue, pink, yellow,orange, purpel, green, brown. For travel, office, school use. 3.SMOOTH IN AND QUICK DRY. With no break in ink flow, you can enjoy a smooth and optimal writing experience as your fountain pen glides elegantly across paper. 4.SAFE AND NON-TOXIC. The ink has been carefully manufactured using only natural dyes giving the composition a neutral, natural, and non-toxic. 5.CONVENIENT AND PRACTICAL. Storage in a clear box, Easy to use and carry. No need to take a bottle of ink. for Ideal for students, school, travel use. Specifications: Material: Plastic+Ink Bore Diameter: 3.4mm Color: Assorted Color Size: Approx. 2.68in Weight: Approx. 18g Quantity: 10 Pieces Package Includes: 10 Pieces Ink Sac note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!