Create fine lines, bold strokes, or even shade on most surfaces, including wood and glass, with Sharpie Brush Tip Permanent Markers. These markers feature large flexible tips, so you can easily control line width using the pressure of your hand. The quick-drying ink is waterproof, smudge-proof, and fade-resistant. Twin-Tip. Marker Ink Type: Permanent; Marker Tip Type: Brush/Needle; Marker Tip Size (text): Ultra-Fine/Broad; Marker Color(s): Assorted.