Filling instructions:The airless bottle must be filled up with liquid when you use them at the first time. Package Include:2 pcs/lot Size: 20ml 105*29mm 30ml 125*29mm 40ml 145*29mm Airless Bottles help keep bacteria and other contaminents out of your organic product or sjincare fore a long lasting product. This bottle will prevent product come in contact with oxygen during use to preserve the active ingredient and maintain shelf life. The Airless Pump Bottle will help to minimize waste as product is being pushed up to the pump via a disk. You can use: serums,creams,lotions,skin care items,moisturizers and other formulations. Bottles can be reused and refilled.