Strokes Art 48 Piece Artist Grade High Quality Watercolor Water Soluble Colored Pencil Set, Soft German Core Produced with carefully selected pigments to obtain high color concentration and give depth to colors Use Wet and Dry, Different colors can be blended together to obtain different tones & effects Color coordinated barrel tips matching each color, Conveniently boxed for easy storage when not in use 3.0 Soft leads create a smooth color laydown for superior blending and shading Adding water to Strokes Watercolor Pencils triggers a watercolor paint effect revealing the complete and unique power of the colors. Conforms to ASTM D4236