High-contrast ink resists fading from exposure to UV, rain, snow, and even mud. Bold, high-contrast colors resist fading when exposed to harsh UV rays, rain, snow and mud. Fine, durable tip delivers bold color and lines on most surfaces, including plastic, glass and wood. Ideal for sporting equipment, camping gear, playground toys, water bottles and more. Writes lines 0.9mm to 1.1 mm wide. Sharpie Extreme Permanent Markers, 2-Pack, Black.