Guangzhou Ocean Environmental Technology Co., LTD ( Guangzhou O.C is a short name) is a high-tech enterprise focusing on environment friendly board-writing products research, manufacturing, sales&marketing. We located at the famous Yushu Industry Science City in Guangzhou. And have two production workshops and a research center with an area of over ten thousand square meters. Guangzhou O.C new writing liquid is a core technology with an independent intellectual property rights and patents , and it is a standard industry which has leaded a position at home and abroad. Our Refill ink has been tested and fulfilled to ROHS(EU), ASTMD-4236(US), TRA(UK). Now our products are well sold to many countries in the world , such as Europe, America, Japan, Korea and so on. Our product is new , green, potential . In order to show you the operation and usage advantage. Welcome to come to our factory . We are committed to build a dust free classroom and write healthily every day !