This is a VT Reedle Trial Set. The set includes one each of S100 and S300. The content of each is 1.5ml. Perfect for those who want to try it out, or for travel! (^^) Quoted from the package: Due to the nature of the ingredients, you may experience a tingling, stinging, or prickling sensation on your skin. How to use: After washing your face, apply an appropriate amount to the entire face as the first step in your nighttime skincare routine. Press your entire face with your palms and massage to blend. This product contains ingredients that refine the skin's surface, preparing it for better absorption of subsequent skincare products, resulting in a smooth and refined complexion. Thank you for viewing. I am also selling on other sites, so I may delete the listing suddenly. Thank you for your understanding.