The universal pen that never dries out! This refillable pen is suitable for overhead projections and almost all surfaces. It features a dry-safe design that allows it to be left open for days without drying out. The aircraft-safe automatic pressure equalization function prevents leaking during flights. It offers excellent smudge and water resistance on nearly all surfaces and dries in seconds. The odorless ink is free from xylene and toluene, ensuring maximum color brilliance.