Quantity: 50 pieces/box, completely meet your family /staff /friends' demands. Single-Use face masks for adults and children. Suitable for home, office, school, outdoor and other public places. Expandable - 3 layer pleated mask has folds that expand to offer full coverage over nose and mouth. The Length is 6.8 inch and the width is 3.8 inch. Easy to Use - Lightweight facial masks. Slip the elastic bands over your ears and press the metal strip around the bridge of your nose to create a light seal around your face. One size fits most. Comfortable - Extra-soft elastic ear loops eliminate pressure to the ears for maximum comfort. Can be used with earloop holders/ mask strap extenders for additional comfort and well-being. Less Bulk = Better Breathability --- A Nanofiber inner layer allows ZUBREX face masks to be thinner than most other disposable masks because Nanofibers are 1000 times thinner than a human hair. This means less bulk but a better breathing experience while blocking out fine particles in the air such as saliva, dust and, pollen. Nano fiber.