* Twin-tip permanent marker
* Two tips in one barrel for convenience
* Felt tip preventing from easy disintegration and giving vibrant color
* Waterproof ink
* Odorless and Xylene-free
* Permanently writable on paper, metal, plastic, bag, etc.
* Certified by ASTM-D4236 from USA and CE-EN71/3 from European Union for Xylene-free approval
* Certified by the Green Label Standard from Thailand Environ