Anti-Radiation EMF Electrosmog Shielding Mask Protect face skin 8901221 50% Silver-Nylon Blend. 50% Cotton Effective RF shielding performance of 50 dB to 3 GHz and beyond Shell: 50% silver-nylon blend, 50% cotton; Lining: 100% cotton Wear this mask to shield RF radiation such as cell phone, wireless devices, microwave oven Size: 7.5 x 3.5 inch (18.5 cm x 9 cm), opening fold: 7.5x 5.5 inch (19 cm x 14 cm); Color: dark pink Care, hand wash, air dry, do not bleach, do not dry clean