Unison color Pastels are made in Northumberland and contain only pure pigments. Unison groups the colors together in sets of related hues, instead of adding white or black pigment to the colors. The result is intense and vibrant shades, not muddied by the blending of colors. Unison's pastels contain very little binder, making them truly soft and smooth. They are mixed to meticulous recipes and are based on traditional pigments such as cadmiums, cobalts and natural and synthetic earths. Pastels measure approximately 3in long x 6/8in diameter (75 x 20mm). Sticks vary slightly due to the hand-making process.