Permanent UV Marker Pen 1,Conform ASTMD-4236,EN71,6P,Lead 2,OEM client' logo 3,Ink can only be seen under uv/black light Permanent Invisible UV Marker PenWe are professional marker of pens manufacturer,owning excellent R&D group and strict QC team."Credit and Quality" is our idea.All of our products can conform international tests standards,EU and US standards.MaterialPPPen tipbullet fiber tipInk ...