This is a brand new, unopened SodaStream bottle. It is an authentic product compatible with all SodaStream sparkling water makers except for the CRYSTAL model. It's a set of two 500ml bottles, easy to use and perfect for finishing. These are popular black bottles! ^_^ The expiration date is 2028.10, so you can use them for a long time. They are dishwasher safe, which makes them more expensive than regular bottles, but I'm offering them at the same price as the regular ones, so please take advantage of this offer. The specifications are the same as the conventional bottles.