4B softness: 4B Soft Eraser, with a soft texture and moderate wiping force, easily erases pencil marks without leaving any residue Not easy to leave marks: After wiping, it is not easy to leave marks, keeping the paper clean and tidy Protecting paper: Soft texture, not easily damaging the surface of the paper, protecting your work Durable and long-lasting: Made of high-quality materials, durable and long-lasting, with a long service life Learn how to use office drawing: used to erase pencil marks, homework errors, modify files, and modify artwork