DASHENG masks are registered by the National Trademark Office of the People's Republic of China, based on the national LD28-92, GB/T2626-92, GB2828-87, GB2829-87 and other dust mask standards, combined with the application of the national standards of different countries in the world, targeted to the development and production of jade masks worn by different countries, regions and people of various kinds of face. Dozens of models were awarded EN149:2001 European CE standard and FFP1, FFP2 and FFP3 quality grades respectively, dozens of models were awarded AS/NZS 1716:1994 Australian standard and American NELSON and NIOSH N95 standard. The company has passed ISO9001 international quality management system certification. The price is $3.70/PC.