graphite with purity and a fine lead core provides smooth lines and minimizes scraping, improving consistency across uses. Paper packaging with a pullout pen box offers convenient access and organized storage, making it easy to take and place pens. Each pen base and pen holder is labeled with the pen model, allowing quick identification and selection of the required brush. Hexagonal pen holder provides a comfortable grip and reduces the chance of slipping during use. use scenarios Studio drawing or brush pen work: quickly grab the correct brush model via the labeled bases and holders, keeping your workflow efficient. Travel or onsite sketching: portable packaging and a stable hexagonal grip support finger comfort and easy transport. Classroom or workshop use: clear model labeling helps students pick the right brush quickly, improving teaching efficiency and reducing mixups.