Oregon multi surface marking crayons: Crayon allows writing and drawing on wood, metal, stone, concrete, tiles, ceramic, plastic, glass, rubber & more 

Pack of 12 professional marker crayons available in:

Blue

Red

Yellow

White

Comes complete with paper sleeve , Six-sided shape to prevent rolling, Pencil diameter: 12mm, length 120mm 

Easy to use, simple to see: Crayons show up on most surfaces and are ideal for tree surgeons, plumbers, builders, carpenters and other professions