Features: Non-Toxic Ink: The calligraphy pen ink has been carefully manufactured using only natural dyes giving the composition a neutral natural and non-toxic ink. Excellent Writing: Our fountain pen cartridges help you enjoy a smooth and optimal writing experience as your fountain pen glides elegantly across the paper with no-break in the Ink flow while you are writing. Quickly Dry Ink: It takes a few seconds to dry when you are using the ink refills. It ensures that writing wouldn't be easily be destroyed. Ideal Gift: It's an ideal gift for your family friends classmates and colleagues as a Christmas New Year gift. Nice Service: Please contact us if its necessary we can always help you. We hope to grow up with you together. Specifications: Material: Ink ABS Single Size: 5*0.34cm Color: Black red blue black erasable blue includes: 50pcs * Ink Sac