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!