Medical oxygen mask(FM-02L/S) (FDA) 1.Silicon,plastic material ... remove 3.Light,safe,well sealed design Medical oxygen mask(FM-02L/S)(CPAP oxygen mask,full face mask)(FDA approved No ... ,durable to use4.It's well sealed to avoid oxygen leakage 5.The price is reasonable and competitive6.It ... can well provide the oxygen to the patients who need 7.OEM service available