SKU: E Chartpak® AD® Marker Gray Set, 25 Markers The Gray set has cool, warm, and basic gray tones in gradient ranges. Experiment with blending and creating highlights and low lights with limited color families. This essential set will allow you to tone other AD Markers as well as create realistic shadows for car design, product design, and landscape architecture renderings. Chartpak's original xylene AD® Markers properties are unlike all alcohol-based markers common to the marketplace, and while they are compatible with one another, they perform very differently. They won't smudge alcohol-based pens including fine liners, they also work well over ballpoint pens and technical pens. To mix a custom color, apply the marker colors to a plastic film like acetate, pick up the marker color and mix them with the Colorless Blender (sold separately) as you would a paintbrush. Once mixed, you can use the blender marker to apply your custom color to your surface. AD markers layer, blend, transfer laser images, and are permanent on many porous and non-porous substrates. However, they are not recommended for use on Styrofoam. These markers are juicy, and last an extremely long time when the cap is applied securely. There is no mistaking the scent of a xylene marker, and for this reason, we always suggest using them in a well-ventilated area. All markers come with a tri-nib point allowing for thin, medium, and broad strokes all within one marker. The nibs are removable and replaceable to extend the life of your marker. Colors include:Basic Gray 1, P226Basic Gray 2, P227Basic Gray 4, P229Basic Gray 5, P230Cool Gray 1, P181Cool Gray 2, P182Cool Gray 3, P183Cool Gray 4, P184Cool Gray 5, P185Cool Gray 6, P186Cool Gray 7, P187Cool Gray 8, P188Cool Gray 9, P189Cool Gray 10, P190Warm Gray 1, P191Warm Gray 2, P192Warm Gray 3, P193Warm Gray 4, P194Warm Gray 5, P195Warm Gray 6, P196Warm Gray 7, P197Warm Gray 8, P198Black, P98Extra Black, P99Super Black, P100Made in the USA Health Labeling: Use in a well-ventilated area. CL, Prop. 65 WARNING: Cancer and Reproductive Harm.