This bold point fabric primary marker tip set is great for kids and adults who create fabric art. Good for marking, drawing and writing on most fabrics surfaces, especially cotton. It is water, chlorine resistant when dry, clean or gentle wash and odorless. The ink is acid free, non toxic, pigmented and dries instantly. Easy to use with no steaming, ironing and mess to clean up. Conforms to ASTM D4236 standard. Package contains 6 bold tip black markers only. Measures 3/4-inch length by 6-1/2-inch width by 4-15/16-inch height. Works best on natural fibers like cotton. Uchida recommends a small test in an inconspicuous area since all fabric types are different. Product may bleed through thinner fabrics.