WY-2312 Permanent marker pen Size:120*20mm Through the ASTM-D4236 and EN-71 Packing:12pcs/color box,80boxes/ctn Double tip permanent marker with oil-based ink,sun-proof and water-proof,non-toxic,never fade fibre tip,write soomthly,good make marks on many surfaces,can not be erasable,suitable for office,school,hotel etc