- Twist-action, 13mm
- Permanent, nontoxic ink is fade-resistant and waterproof
- Marks on almost any surface in any weather condition
- Performs in a broad range of temperatures whether hot or cold
You can use this excellent solid marker pens to use on your BCD , drysuit or on cylinder(Steel) these marker pens are 100% waterproof and do not forget these pens are permanent.