marker pen 1.environment protection,no harmful 2.8 colors, more bright 3.go with LED writing board 4.SGS report new marker pen for led ad board -- Water-based, dry-wipe prescription-- Easy to wipe off with wiper, tissue paper, etc.-- High Brightness neon color, best for indication on Mirror / Plastic board / Light board / Glass etc.-- Water-base without toxic, no harmful to skin-- 8 colors for ...