Rollerball with warning light at the end of the pen. It indicates when the writing pressure is too great and teaches you to dose the pressure correctly in order to write loosely. Ideal for beginners and people with motor problems. Base Senso writes with the exchangeable roller cartridge 852 with ball point, ink color royal blue erasable. The writing dries quickly and is smudge-proof, even when marked with a highlighter. The ergonomically shaped handle is elastic and non-slip rubberized and large finger surfaces prevent pressure points. Suitable for right and left-handers alike.