Simple design for precision and control. Zebra Technical Pens are an excellent tool for illustrations, sketching or writing. The metal guide-pipe provides excellent control when precision is a necessity. Featuring acid free and archival quality black ink, Zebra's Technical Pens deliver clean, water resistant, smooth lines. The vibrant pigment ink is bleed free and quick drying, ensuring high quality results for your drawing, drafting or designing. Choose from a variety of point sizes to ensure you have the best tools for even the most complex projects!