Their quality and technical indexes reach a high level.

They can secure the whole body and respiratory organs from epidemics caused by malignant viruses even at 30 degrees below zero.

They, capable of preventing the inroads of germ and virus as well as any toxic substances, can be used several times for their long serviceable life.

As they have perfect anti-epidemic functions for constitutional conditions of our people, they are greatly conducive to vigorously carrying out the anti-epidemic work at many units.