1.maintence free, envrionment protection , green products. 2.personal protective or industry protective. 3.It is suitable for the use in factory , evvionment protection , public place and so on . 4.soft and round earloops ,ideal for senstive skin. 5.price terms:FOB shanghai ,China 4.size:18cm x 13cm x 13 cm 5.3.best protrction from the virus and dust