From Amazon
Staedtler Lumocolor 318F Permanent Markers Fine Tip Pack of 3 Blackaa
Conrad Electronic
Staedtler Lumocolor permanent F DRY SAFE 318-9 Permanent marker Black waterproof: Yes
Athema Services
318-9 staedtler staedtler lumocolor ohp pen perm fine 0.6mm black 318