Base Senso rollerball pen, cap model, cartridge type designation: roller cartridge 852, type of ink: erasable ink, cartridge design: rollerball tip, M, royal blue, replaceable cartridge, can be left open for several days without drying out. Ink storage technology: Free Ink System, pen design: plastic, rubberized grip for learning to write. A warning light at the end of the pen indicates when the writing pressure is too high. Ideal for beginners and individuals with motor difficulties. Suitable for both right-handed and left-handed users, barrel color: pink-red.