The 20oz lid has a top diameter of 3.35in, a bottom diameter of 3.15in, and a thickness of 0.9in. Please use it on cups with a diameter of 3.15in~3.35in.
The 30oz lid has a top diameter of 3.93in, a bottom diameter of 3.54in, and a thickness of 0.9in. Please use it on cups with a diameter of 3.54in~3.93in.