※ This product's price will be reduced periodically if it doesn't sell, so please refrain from making price reduction comments. Sheet masks: 24 total KISO Series: Hydroquinone: 4 sheets Human Stem Cell Culture Solution: 4 sheets Niacinamide: 4 sheets Panthenol: 4 sheets EGF: 4 sheets Azelaic Acid: 3 sheets Bonus: Torriden Dive-In Mask: 1 sheet The KISO series was purchased at the end of November 2023, and the Torriden mask was purchased in May 2023. I am a non-smoker and do not have any pets, but please understand that these items have been stored at home. Thank you.