This is a hollowed out sleeve for the Aspire Atlantis Tank. You can use it to replace the original pyrex glass tank to make your device look a lot more stylish. It is also a lot more durable and this means that if you keep breaking your tank you will really want this. It does have a pyrex glass tank but the sleeve provides protection which should help if you drop it or step on it. It can be screwed onto the base of your tank really easily and it has the air tube to connect to your coil so it will all work properly. It is really easy to fit and you will find that it looks great and helps protect your glass tank. It has an anti-leak design which is unique as well and has a 2ml capacity. It is only compatible with the Aspire Atlantic Sub Ohm Tank.