oval was founded by Frank Wang and Mose Yen in 1988, following the brand spirit, “Eco-Friendly”, oval keeps advocating the concept of “No CFC” which obtain several certifications for our correction pen products.” Conforms to ASTM D-4236, American human health and safety Standards TÜV Rheinland Certified and EN 71 European safety standard AQSIQ certified, authorized by National Center of Measurement and Testing for East China. HC21721/380 certified Based on our belief in protecting our environment and our world, oval has built a well-known name and brand worldwide known as quality, reliability and environmentalism.