the Exterior Design of This Gel Pen is Made of Eco Friendly Bamboo Material, Replacing the Traditional Plastic Material. Bamboo is a Renewable Resource That Grows Fast & has Relatively Low Environmental Impact. Therefore, Gel Pen Made of Bamboo Can Effectively Reduce the Burden on the Environment, & Are an Eco Friendly & Sustainable Choice. This Bamboo Gel Pen is Equipped with Premium Gel Ink to Ensure a Smooth & Smooth Writing Experience. Its Nib & Ink Formula Are Carefully Designed to Avoid Problems Such as Clogging or Ink Leakage, & Provide Reliable Quality Assurance for Your Writing. You Can Customize the Logo or Brand Logo Printed on the Appearance of the Pen According to Your Needs.