A Sennelier pastel "à l'écu" is an extra-soft pastel composed of high-quality pure pigment, grounded with a natural transparent binder. The high-quality composition of Sennelier soft pastels is due to a perfect balance between binder and pigment. For gradient shades, increasing amounts of mineral fines are added, ultimately tending towards white. Their exceptional brightness is a result of the high-quality pigment, and of the natural mineral fines discovered by Sennelier in 1905, which are still used today. Presented in a high-quality wood box, this Sennelier set is filled with 175 extra-soft pastels made with pigments chosen for colourfastness and brilliance.