Garden Markers for Outdoor Use, 0.8 mm Medium Point, Black - Fade Resistant Ink, Waterproof, Xylene Free, No Smudging, Dries Quick, Alcohol Based Garden Marker Pen, Use On Almost Any Surface :
Artline Garden Markers - Quick Dry Ink for Outdoor Use - Water and Sun Resistant Ink (Pack of 6) : Amazon.ca: Office Products