"High" and "Low" refer to the shape of the bow, Joe — the China Boy 'Low' models have a bow with a shallower angle (flatter) than the China Boy 'High' models. The different bow angles carry the tension differently, which changes the cymbal's response, pitch and sustain.I was as a long time straight swish player a little suspicious when they that model came out and further was split into high and Low. Like what. The regular Swish (for 40 years+ ) wasn't enough?
So I never understood what they were or even saw one. Sorry no help.
The still offer the 18" versions of both, I just looked at their website. If you want a larger A, the 22" Swish Knocker is still there, but not filed under the china category, you need to search for it in the A family list.Zildjian discontinued the Lows in the A line