The Pressing Rubber Pen is perfect for all of your writing needs! This pen has an adjustable length, so you can choose the right size for each individual task. Plus, it comes with three rubber cores that are easy to install. The Pressing Rubber Pen is also great for keeping your workspace organized and neat. With this product, there's no need to keep extra unused supplies lying around. It's easy to use — just press the core out and you're ready to go. Get the Pressing Rubber Pen today and experience comfort and convenience!