The Permanent Marker 407 in blue is smear- and waterproof and writes on nearly anything! It has a round 1.5 mm tip.

Permanent Marker 407 Blue
- writes, paints, and marks on almost all materials including metal, glass and plastic
- smear- and waterproof
- available with chisel tip (M) or round tip (F)
- available in 4 writing colours (Black, Blue, Red, Green)
- without xylol/toluene