New 2002
The surface layer is 40s gauze, the second layer is 23g KN95 filter material, the third layer is 20g hot air cotton, and the fourth layer is 60g hot air cotton; folded a total of eight layers.
2002 Multifunction
The surface layer is 32s gauze, the second layer is 20g KN95 filter material, and the inner layer is 90g needle-punched cotton (dot plastic); a total of six layers are folded.
2003
The surface layer is 32s gauze, the second layer is 23g KN95 filter material, the third layer is 20g hot air cotton, and the fourth layer is 60g hot air cotton; folded a total of eight layers.
New 9000
The surface layer is 32s gauze, the second layer is 23g KN95 filter material, the third layer is 20g hot air cotton, and the fourth layer is 60g hot air cotton; folded a total of eight layers.
Activated carbon thickening
The surface layer is 32s gauze, the second layer is activated carbon cloth, the third layer is 20g KN95 filter material, and the inner layer is 90g needle-punched cotton; a total of eight layers are folded.
2005
The surface layer is 40s gauze, the second layer is 45g hot air cotton, the third layer is 20g BFE99 filter material, and the inner layer is 25g spunbond.