COPIC MARKER-Sketch Gray Marker Set. Excellent for all forms of illustration, design, scrapbooking, fine art and more. They have an alcohol-based ink that is permanent, non-toxic, low odor and acid- free. This package contains twelve dual-tipped Copic markers in different shades of gray in one 5-3/4x4-1/4x1-1/2 inch case. Comes in multiple sets. Each sold separately. Conforms to ASTM D 4236. Imported.