- Material and build: The sketch wipe pen is made from quality sponge, felt and ABS. The black tip is sponge and the white tip is felt. The sponge tip is reusable and gentle on paper, with low peeling tendency. The ABS shell provides a comfortable grip and long life. - Set contents: Includes 14 sponge pens in two sizes to cover most art projects. A practical addition to any art kit, ensuring a tool is ready when inspiration strikes. - Size details: The bigger pen has a tip diameter of about 0.47 inches and a total length of about 5.94 inches. The smaller pen has a tip diameter of about 0.24 inches and a total length of about 5.51 inches. This range supports versatile creative needs. - Double headed design and usage: Each pen is double ended. The larger black tip is used for shadow transitions and broad blending; the smaller black tip handles detailing. The larger white tip blends midtones into shadows or brighter areas, while the smaller white tip is ideal for fine details. - Practical applications: Great for shading, smoothing, and softening edges in sketches, portraits, landscapes, and mixed media. Suitable for classroom, studio, or on-the-go use.