The SodaStream Carbonating Bottles 2 pack features black tops and a size of 1 liter, perfect for making homemade sodas with your SodaStream soda maker. These brand new bottles are included in the package, providing you with everything you need to create your own fizzy beverages at home. With the SodaStream brand, you can trust in the quality and durability of these carbonating bottles for all your soda making needs.