Material Liquid silicone Size 19*19*11cm Special note This product can not be used alone, need to be paired with oxygen supply system and oxygen cylinder input oxygen. Product features Liquid silicone wrap adhesive PC mask body two parts The headband is comfortable to wear and easy to remove; Soft and comfortable liquid silicone, high definition mirror; Both sides can open and close the air outlet valve; Compatible with all respiratory equipment, strong airtight; Ventilator connector universal 22mm diameter interface; Breathing joint can rotate 360 degrees; Application respiratory protection, industrial protection, industrial field, laboratory. ITEM LIST 1 set* 1 PC cover, 1 liquid silicone, 1 elbow buckle, 1 strap