These tops fit the NSF Stanley ErgoServ airpot. The airpot is sold with a Black top. These are additional tops that you can get to go with your ErgoServ to allow you to color-code the airpot contents.
While the Stanley ErgoServ Airpot comes with a Black lid (with a black dot on its center), these additional lids can be switched between Black, and one other color. As shown in the picture, there is a choice of 4 other colors.