These tactical writing pens can write smoothly on a variety of paper, and the black ink will not penetrate the paper, providing you with a comfortable writing experience. Main material of pens: ABS. Multifunctional and Practical: the 6 in 1 tool pen is designed with 6 handy functions, including a refillable pen, a level gauge, a ruler, slot and cross screwdrivers, and a touch screen stylus, convenient for you to use.