featurestrong water-oil resistence / reusablefunctionFR,antibacterial,breathableUsesair,water,filter oil Industry StandardGB (Polyether and polyester) ape
featurestrong water-oil resistence / reusablefunctionFR,antibacterial,breathableUsesair,water,filter oil Industry StandardGB (Polyether and polyester) ape
featurestrong water-oil resistence / reusablefunctionFR,antibacterial,breathableUsesair,water,filter oil Industry StandardGB (Polyether and polyester) ape
featurestrong water-oil resistence / reusablefunctionFR,antibacterial,breathableUsesair,water,filter oil Industry StandardGB (Polyether and polyester) ape
when the sound waves incident into it, it can cause gaps in the air vibration; the viscous drag due to air friction and pore walls, so that a considerable part of the sound energy into heat energy h