Features: (10Pcs) Refillable Marker Pens empty tube for smooth writing and refills, combining uninterrupted flows. Transparent plastic barrels allow real time monitoring, while lightweight construction ensures portability for creative professional and students. Designed for students, office workers, artists, and users seeking cost effective, versatile writing tools. Ideal for classrooms, business meetings, travel, and artistic projects requiring reliability visibility and continuous performances. Multi functional design supports writing, sketching, labeling, and craft projects with consistent flows and reduced waste. Specifications: Component: Plastic, Total length: Approx.138.8mm/5.46in Diameter: Approx.12.2mm/0.48inch Color: Clear Features: Straight liquid design, which facilitates users by themselves and extends service life. Practicality: It is suitable for various scenarios such as office, study, and painting. The addition function allows users to enjoy a personalize creative experience. Package Includes: (10pieces) Marker Empty Tube note: Please allow 1-10mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.