Marabu Graphix Sketch Markers feature bright, vibrant colours due to the high quality, low odour, fast drying, alcohol based ink. These markers are double-ended with a 1-7mm chisel tip on one end and fine, 1mm brush nib on the other. These nibs are ideal for shading and creating colour gradients. Best results are achieved on marker paper. Organic solvent based and free from toluene and xylene.