These high-quality, water-based ink markers can write on flat, dry surfaces such as paper, plastic, glass, canvas, metal and concrete. The ink is water-resistant to water washing over the painted surface, but will come off with water and hard scrubbing. The clear barrel design allows the artist to see how much ink is left in the marker. Both the Large and Short Large size come in a variety of colors and have a 1/2" wide chisel nib with different barrel sizes to suit artists needs. The XL size has a 1" wide chisel nib and the XXL size has a 2" wide chisel nib.