We already assembled it for you! Zilla QuickBuild Terrariums offer a unique glass design that is easy to assemble and sturdy. The Zilla QuickBuild Terrariums feature a front opening glass door and double hinged locking top screen with feeding port. The bottom of the terrarium has a removable bedding tray for easy clean up. These terrariums also feature a top stackable design to make it easier to house multiple animals. Features front opening doors for easier access Top screen locks in frame and securely locks in place Top Screen can open on either side Stackable design Two side pins allow for a customizable external background Perfect for reptiles and amphibians Locking top feeding port Sturdy glass drop down front opening glass door Removable bedding tray to make cleaning substrate easier