FeaturesWrites on almost any surfaceMedium tip writes a line width of 1mmInk is heat proof, frost proof, waterproof and lightfastBlack permanent inkPack of 10The Stabilo Write-4-all Medium Permanent Marker will write on almost any surface, including glass, metal, plastic, wood, photos, foil, ceramics, card, CDs and DVDs. The medium tip writes a line width of 1.0mm and the permanent ink is heat proof, frost proof, waterproof and lightfast. This pack contains 10 medium black markers.