face mask soft non woven fabrics,breathable and confortable differene size and color both 2,3,4ply BFE95% 99%(NELSON disposable face mask with tie(ear ... loop)1.top sheet:soft non woven fabrics,breathable and confortable2.Size: 17.5 x 9.5cm,14.5x9.5cm,12.5x9 ... ,25+25+25g etc(mostly according to our customer requirement)5.Filter rate:≥90% 95% or 99% (we have ...