BIGTHUMB Black Poster Markers Jumbo: 5 Pcs 15mm Wide Tip Thick Acrylic Paint Pen Large Permanent Calligraphy Markers for Rock Painting, Stone, Poster, Canvas, Glass, Wood, Ceramic

Customers find these markers to be of great quality, with one noting they're better than Sharpies, and they work well on walls. They are easy to use and deliver good color results. Customers appreciate their durability, with one mentioning they don't fade in the sun, and find them versatile for various projects, with one highlighting their effectiveness for protest posters.