I’ve got two.
A large one about 4/5” across, its too big to use with an Avon rod to be honest, only any use in the margin. This is the same style as pictured above.
Then I have a more practical one about 2” across, tbh though I’ve still not used it. This is plastic and much lighter/quieter and made by Dinsmore.
Rarely do I use a stopper these days, opting for PVA.