This is a tray to use with your Alien Pod Shot Glasses. The raised grating and middle Walkway supplied here are vented, so when you put dry ice on the Bottom Tray, the dry ice (smoke) will curl up and around the Alien Pod Shot Glasses you've placed on the tray. In this collection are the Bottom Tray (in six parts for easier printing), Raised Grating (in six parts for easier printing), and Walkway (in four parts for easier printing). I've also included the whole Bottom Tray, Raised Gridwork, and Walkway if you'd like to portion parts out differently.