Grumbacher Pre-tested oils contain the finest pure pigments milled in select alkali-refined linseed oil. they offer high chroma, superior tinting strength, excellent adhesion, outstanding working properties, the utmost light fastness, and archival permanence. Truly a professional paint, the majority of our colors are single pigment with superior tinting strength and have a lightfast rating of 1-excellent. This set contains 10 colors in 24ml/0.81 oz tubes of Alizarin Crimson, Grumbacher Red, Yellow Ochre, Bismuth Yellow, Thalo Green (Blue Shade), Thalo Blue, Burnt Umber, Burnt Sienna, Ivory Black and Titanium White. Made in USA.