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 30 Ü This set contains artist crayons in 30 colors, including White, Light Gray, Gray, Black, Yellow, Orange, Ochre, Raw Umber, Salmon, Brown, Vermilion, Russet, Scarlet, Carmine, Pink, Purple, Lilac, Violet, Periwinkle Blue, Ultramarine, Prussian Blue, Cobalt Blue, Light Blue, Turquoise Blue, Malachite Green, Emerald Green, Yellow Green, Lemon Yellow, Light Olive, and Olive.