... :200gsm,180/320gsm available 3.Single headstrap dental product composite -Weight:200gsm,180/320gsm available-Soft, lightweight-Single ... head strap, single layer.-Hygienic, Non-irritating to skin, Odorless, and Easier breathing-Made from Melt Blown ... .-Perfect fitting: Adjustable inner and outer nosepiece, suitable to any face and ensure comfortable wearing -High filtration efficiency ...