I only wish that there had been 4 sizes. The large one is not large enough to plug up a regular old bong. Which I have and still use.
I like the new things that I buy at 420 Science, however I do switch
off while other Pipes are awaiting to be cleaned. There are 3 plugs.
There were really two sizes I needed. 1 smaller to fit my new pipe and a larger one. But, what are you going to do. Just wait until something else comes out.