Finally a line of marking pens that will last! Our Garden Marker Pens are fast drying, waterproof and contain ultraviolet filters for maximum fade resistance in outdoor sunlight. These pens are xylene free which makes them environmentally friendly. Furthermore, they write on wood, plastic, metal, glass, porcelain and many other materials. The 1.2mm pen features a wider tip and a plastic barrel, while the 0.8mm tip pen is smaller and has an aluminum barrel.