Valve size does not fit all straws.. Size info missing from package.
Be aware that these do not fit large straws.  They are hard plastic rather than a silicon or soft plastic, so the size of the straw size needs to match the valve size or there will not be an adequate seal. There probably is a straw they do fit--but the package does not  list a size so I am not sure.  They do not fit the large reusable straws we own.
Rating: 3 stars