COPIC markers are versatile double-ended refillable markers with fast-drying, permanent non-toxic alcohol based ink. The Sketch marker features a comfortable oval barrel with a super brush nib on one end that is perfect for doing professional illustration, fashion design, Manga, and adding detail to your images. The Sketch super brush nib acts like a paintbrush both in feel and color application. For more control, use the medium broad nib on the opposite end of the marker. Both nibs are replaceable.