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Children Safe Water Color Pen Tips Axe-Shape Nibs. Axe-Shape Nib Design: Specialized sintered nibs designed for smooth writing and high resistance to organic solvents. High Resilience: Allows for compression without damage, ensuring durability and consistent performance. Wide Compatibility: Suitable for water-based ink, alcohol ink, highlighters, and watercolor pens. Custom Service Available: We design and produce nibs according to your specific preferences and requirements. Free Samples: Free samples are available for testing and quality verification before bulk orders. Fast Lead Time: Off-season lead time is within 15 workdays, ensuring quick delivery for urgent needs.