Foil pens are ideal for marking labels, foil or heat shrink tubes. Create waterproof, wipe proof and resistant markings. We offer black and red pens, also with line thickness of 0.02 inch (0.4 mm), super fine. With these permanent markers you create smudge-proof and waterproof markings on almost all sufaces such as glas, pastic, metal etc. The pens are DRY SAFE and can be left uncapped for days without drying out.