Staedtler Lumocolor Permanent Marker Set of 4

Permanent waterproof quick drying ink Writes on most surfaces Cap can be left off for up to 14 days without ink drying out.
Excellent smudge-proof and waterproof qualities on almost all surfaces.
Dries in seconds, therefore ideal for left-handed users
Colour-intensive, low-odour.
Lightfast (black and green for over 10 years on paper)
Black and green are weatherproof.