Steam Eye Mask Lavender 10 sheets, October 17, 2023 Menthol in 12 sheets, August 13, 2023 Stored in a dark place. They were in a box, but I took them out for the photos. According to the Kao website, they can be used safely for 3 years from the date of manufacture. I'm selling them at a significantly reduced price, so individual sales and price reductions are not possible.