Try your hand at design with handy Ratline shirt markers! They're easy to use and work well on shirts, sweatshirts, jeans, and linens that are made of cotton. Shirt markers are waterproof and fade proof, with water based, xylene free pigment ink. Polyester fiber tip with 2. 0 mm writing width. ACMI AP certified. Versatile tip can create bold, wide lines, or slim, narrow ones based on writing angle. Create the perfect original t-shirt in a few easy steps: choose a design, trace and color on the shirt and iron once ink is dry. Finished shirt is laundry safe up to 140° Fahrenheit. Single pack includes 6, assorted color shirt markers. Vivid colors include: Light Blue, Light Purple, Fluor Pink, Fluor Orange, Fluor Yellow, Fluor Green.