Prismacolor Premier Soft Core Colored Pencil, Blue Slate (3408) Soft leads create a smooth color laydown for superior blending and shading. Thick, long-lasting color cores resist breakage and bring bold statements to life. Pigments are slow to wear, light-resistant, and waterproof. A wide array of colors to choose from makes it easy to find a soft spot for these premium pencils. Vivid and intense in one stroke and subtle and soft in the next, they are perfect for any project.