Long-lasting Writing Experience: The tip of the BFANGZ infinity pencil is made of black tungsten metal alloy, which can decompose the alloy metal molecules when rubbed on the paper, leaving them on the paper surface, so as to achieve long-lasting writing. This design allows you to sharpen the pencil frequently without worrying about the interruption of ink or lead, allowing your children to focus more on learning and drawing, thereby improving efficiency. Environmental Protection and Value for Money: The durability of infinity pencil far exceeds that of traditional pencils. Each permanent pencil can write up to 2 million characters, which is equivalent to the writing volume of 100 ordinary wooden pencils. It may save a lot of wood and is very environmentally friendly. It also saves you a lot of money and is a great investment. Best Christmas Gift Choice: BFANGZ permanent pencil is a thoughtful and practical cool gift, especially suitable for giving to students, teachers, friends and painting enthusiasts at Christmas. It does not need to be sharpened, the tip will not break, there is no need to worry about the interruption of ink, and it will not dirty your hands when writing. It is an ideal gift choice for Christmas. Smooth Writing and Comfortable Grip: The writing and drawing experience of the infinity pencil is very smooth, just like ordinary pencils. The blackness of the written words is similar to the BH grade of ordinary pencils, and the handwriting can be easily erased with an eraser. The grip adopts an ergonomic groove design, which provides a more comfortable grip and better control than traditional pencils, effectively reducing hand fatigue when writing for a long time. Multifunctional Use: The forever pencil is not only suitable for writing, but also for painting, sketching, pentel, drawing diagrams and other art projects. It is an ideal choice for students, teachers, and artists. It can be written on notebooks, stone paper, kraft paper, and most papers, and can also be used on different materials such as wood, wall, metal surface, etc., to meet your diverse needs. Rich Kit Content: Our set includes 4 infinite pencils, equipped with 8 replaceable alloy nibs, and 4 erasers, all of which are packed in a transparent pencil case for your convenience. Infinity Forever Pencil - 0.7mm Infinite Everlasting Metal Inkless Pencils Set with Eraser , No Need Sharpened, Replace Mechanical Pen for Sketch , Drawing and Writing（With 8Pcs Nibs and Pen Case）