This is a pack of 4 Stabilo Write-4-All Marker Pen, which are permanent marker pens in assorted colours. Writing in waterproof, freeze and fade-resistant ink, the Stabilo Write-4-All Marker Pen can be used on any surface, including glass, metal, wood, plastic, china, film, card and CDs. The pens ink is also alcohol-based yet odourless. This Stabilo permanent marker has a tough plastic tip that produces a 0.7mm line, and writes clearly on any hard surfaces. This exceptionally durable marker is reliable under extreme conditions such as cold, heat or rain, and is therefore suitable for use on freezers or greenhouses.