These water-resistant crayons are soft and easy to work with. They feature exceptional covering power, excellent lightfastness, and are great for underpainting. Their hardness allows them to be sharpened more easily for detail and edge work. Crayons are soluble in mineral spirits for wash techniques. Each stick is 3/8" diameter _ 4" long(10 mm _ 102 mm). Usable on a variety of materials including but not limited to: paper, cardboard, glass, wood, leather, fabric, stone and more.Set of 40 Ü This set contains artist crayons in 40 colors, including White, Light Gray, Gray, Black, Yellow, Toledo Brown, Orange, Ochre, Raw Umber, Flame Red, Salmon, Brown, Vermilion, Russet, Burnt Sienna, Scarlet, Carmine, Pink, Purple, Lilac, Violet, Periwinkle Blue, Ultramarine, Prussian Blue, Cobalt Blue, Light Blue, Turquoise Blue, Malachite Green, Emerald Green, Grass Green, Yellow Green, Lemon Yellow, Light Olive, Olive, Paynes' Gray, Sahara Yellow, Light Cadmium Red Hue, Crimson Alizarin Hue, Dark Ultramarine, and Light Cobalt Blue Hue.