The 10239 is a touch screen pen designed for use with the Waveshare 7-inch Capacitive Touch Screen LCD. This stylus pen is constructed from stainless steel and aluminum alloy, and is specially designed for accurate touch and control of the touch screen LCD. It features a 10mm long nib, allowing for precise control and pressure-sensitive accuracy. The pen is battery-free, eliminating the need for frequent charging. It also comes with a built-in eraser for quickly fixing any mistakes made on the screen. Additionally, the pen is lightweight and ergonomic, allowing for comfortable use. The 10239 is ideal for making accurate selections, navigating menus, drawing, writing and precision control of interactive displays.