Legendary Rapidograpg stainless steel tubular tips. Engraver's precision. Perfect for embellishing, outlining, illustraating, loose sketching, and pointillist technique. 7 pens with nib keys and ink. Set of 7 Rapidograph pens contains 3085-f Ultradraw ink. For drawing on paper. No clogging!Waterproof! Ultradraw provides good open time, but dries quickly on paper. No ammonia or other unpleasent odors. Dense blackness, easy flowing. Non-smearing. Good erase-ability but otherwise permanent. Special smaller tip sizes for fine art use: 6x0, 4x0, 3x0, 00, 0, 1, and 2.