Hydra Facial Serums pack of 3 400ml AS1, SA2, and AO3 Hydrogen Oxygen Facial Machine Serums100% Original Items Quantity: 400ml x 3 Machine Serum: These serums are used in conjunction with beauty equipment such as the hydrogen oxygen facial cleaner. These serums can be used individually or in combination according to the need. AS1: It is natural plant extraction. It helps in clearing dirt from your face. This peeling solution can improve the skin very well and leaves your face fresh and bright. SA2: It effectively soothes and calms skin with