This M Graham Tube Oil Paint Basic Color 5-Color Set with Walnut Alkyd and Walnut Oil Medium has the most beautiful and easily worked color produced today. Each color is crafted only from artists pigments, free from extenders or adulterants and dispersed in pure non-yellowing American walnut oil. Be solvent free by using the walnut oil to clean brushes the natural way. No toxic fumes. Set includes one each Azo Yellow, Naphthol Red, Ultramarine Blue, Phthalo Green and Titanium White plus free 4oz Walnut Alkyd and 4oz Walnut Oil Medium.