HoMedics Healthcare & Diagnostics has developed a disposable General Use Face Mask with multiple layers of nonwoven fabric. Masks are adjustable for a proper fit. Mask is NOT intended for use in a medical or clinical setting. Caution Statements for HoMedics® Face Masks Face Mask, Single Use Not for use in atmospheres containing less than 19.5% oxygen. Not for use in atmospheres immediately dangerous to life or health. Do not exceed maximum-use concentrations established by regulatory standards. Failure to properly use and maintain this product could result in injury or death. Never substitute, modify, add, or omit parts. Use only exact replacement parts in the configuration as specified by the manufacturer. Refer to User Instructions, or maintenance manuals for information on use and maintenance of these face masks.