Size options Our blending sponge pens come in two sizes to meet different tasks. The larger pen has a nib diameter of about 0.47 inch (1.2 cm) and a total length of 5.9 inch (15 cm). The smaller pen has a nib diameter of about 0.29 inch (0.75 cm) and a total length of 5.51 inch (14 cm). Package contents Includes 6 blending pens in 2 sizes. Suitable for personal use and art classes. The white felt tip may contain some black wool, but this does not affect use. Double-tip design The larger pen features a black tip for shadow-side transitions and a white tip for transitioning halftones into light and dark sides or blending light areas. The smaller pen has a black tip for detailing, enabling more dynamic lines in your sketches. Reliable material Tips are made with a black sponge tip and a white felt tip mounted on a sturdy plastic pole. This combination provides smooth blending, with durable, comfortable handling. The pens are washable and reusable. Use scenarios - Shading portraits, still lifes, and other drawings with smooth tonal transitions. - Blending halftones and light to dark areas in pencil or ink sketches. - Adding fine details and textures to landscapes or illustrations.