Sharpie Permanent Markers are available in an extra-strength version that produces bolder lines than ever before. They are extra-durable so that you can be sure they won’t run out quickly. They are ideal for situations where a standard permanent marker just won’t do. These black permanent markers deliver lines that are bold, strong and appear on almost any surface. They are fade-resistant, waterproof and smudge-proof and made from certified non-toxic ink. These Sharpie Permanent Markers come in a two-pack and are ideal for heavy use on wood, stone, leather and other tough surfaces. Stock up on them to use at home, in the classroom, at the office, out in the field and more.