The Williamsburg Oil Neutral Gray 4pc Set includes 37ml tubes in 4 different colors, including Neutral Gray N2, Neutral Gray N4, Neutral Gray N6, and Neutral Gray N8. Allows artists to create full value grisaille paintings, and gives artists more control of color value throughout the painting. Pigments are ground in pure alkali-refined, ph balanced linseed oil. Neutral Gray Set of 4, 37ml tubes Includes Neutral Grays N2, N4, N6, and N8 Gives artists more control of color value throughout the painting Pigments are ground in pure alkali-refined, ph balanced linseed oil