The universal pen that never dries out! This refillable pen is suitable for overhead projection and almost all surfaces. It features a dry safe design, allowing it to be left open for days without drying out (test ISO 554). The airplane-safe automatic pressure compensation prevents the pen from leaking during flights. It offers excellent wipe and waterproof performance on nearly all surfaces and dries in seconds. The low-odour ink is free from xylene and toluene, providing the highest colour brilliance.