Quality Construction: Crafted with a robust PP material pen tube and polyester-acrylic tips, these refill paint markers are both sturdy and reliable. The transparent design allows for easy monitoring of ink levels, ensuring you never run out unexpectedly during sessions. Innovative Design Features: Each marker includes a steel ball mixer within the transparent pen tube to consistent ink flow and smooth application. This feature eliminates the hassle of uneven ink and provides a superior writing and painting experience. User-Friendly: Simplify your artistic endeavors with these easy-to-fill paint pens. Remove the tip to add paint or ink, reassemble, and you're set to create. Designed for both beginners and professionals, these markers support all types of artistic with ease. Versatile & Abundant: This 40-pack of dual-tipped markers offers ample supply for all your artistic or touch-up needs. Whether detailing, highlighting, or underlining, these pens provide the versatility needed for diverse projects. Broad Compatibility: Ideal for artistic mediums, these graffiti markers can be filled with acrylics, oil paints, watercolors, and more. Enhance your capabilities and explore endless possibilities in applications. Please note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:Transparent-White Material:Plastic Size:3mm Package Contents: 40 x empty paint pen Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.