The New Envo Mask Replacement Filters by Sleepnet come in a lot of 20 with an expiration date of 01/2026. These disposable filters are designed for adults and feature an adjustable fitting for a comfortable and secure fit. The white filters are flexible and made in the United States, providing respiratory protection for various applications. Perfect for home use or in a workshop setting, these EnvoMask filters offer reliable protection for your health and safety.