Snap this cover on your open can of pop to help keep the fizz in.. Works great on Coke cans. Push the lid down from the top while holding the bottom of the can to put it on. Use your thumbs under the lip of the lid to pop it off. May need to be trimmed or filed a bit to get the best fit. Scale by 25.4 for proper size. The one with the Biohazard symbol is the correct size.