I really wanted to like those masks because the price was good and I need several masks every day for my work. From the first 18 masks only 6 didn’t break. 5 of them the elastic broke right away seconds after I took out of the box and 1 broke few minutes into a treatment (I had to leave the room and the patient to put another mask on). That is very dangerous when a mask breaks while I’m treating patients. I simply can’t use those masks for work at all.