The Oof Tank's design is a large, yellow Robloxian head. The head's face is usually a sad face. There is a red and grey cap with the "R" logo of Roblox symbol on the tank.
Every so often (when submerged in water or acid), it will make an "OOF!" sound, which can fool surrounding players believe a player has died. When the OOF sound happens, its sad face will then change into a surprised face. This tank can be used for trolling.