Washable masks, pack of 4, model number HS1016, washable below 40°C. - Type: Washable mask - Quantity: Pack of 4 - Operating temperature: Below 40°C - Model number: HS1016 - Intended use: Non-medical These have been stored at home. The manufacturing date is July 12, 2021, and the quality is expected to be maintained for 2 years from that date. As that period has passed, please understand this before purchasing. Thank you for viewing.