Storage case. Acid-free ink (no added acid; no measurable pH). Color Collection 24 Great Colors: forest green; key lime; margarita green; yellow blaze; summer melon; peach parfait; pink flamingo; Polynesian purple; petal pink; fandango pink; rambunctious red; sunset orange; tuxedo black; hot aqua; misty blue; blue skies blue; oceanview blue; deep sea blue; plumtastic purple; desert rose; woodsy brown; honey brown; tiki hut tan; cloud nine grey. Bold, long-lasting colors. Marks on just about everything including glass, metal, plastic, photos, foils, coated paper, oily and damp surfaces. Ultra comfy rubber grip for comfort and control. Convenient storage case. Conforms to ASTM D4236. Non-toxic. ACMI - Arts & Creative Materials Institute Certified. Assembled in USA.