bao core bxt smooth double tips waterproof ecofriendly ink whiteboard pen signature pen gel pen marker pen for cd 1.0mm/0.5mm line width 12pcs/pack black bxt product description: double pen tip: 1.0mm for the big tip and 0.5mm for the small. made of eco-friendly ink and safe to use in many occassions: sales promotion, gifts, fairs, house, office, school, work-shop etc. easy to dry and waterproof material used, writing smoothly on message boards, whiteboards, mirrors, glass, metal, cd markers etc. low-carbon technology,non-xylene, ecofriendly the ink is approved by the test of international safe standard of astm d-4236 en-71 notes: * cover the tip and keep it be horizontal after using. *do not put in high temperature place. *keep it away from the children under 3 years old. why buy from us: 7*24 tech. support! *100% satisfaction guaranteed! *delivery reliable, usps / ups tracked, usually shipping from us within the next business day!