So aside from material and overall design (like, does it contain a bearing, or how is the string attached), there are three physical characteristics to consider: shape, weight, and overall size.
Now, correct me if I’m wrong, but I get the impression that weight is the number one factor in choosing a counterweight. But how important is size or shape?
I’ve never tried 5A before, so I don’t know what makes for a good counterweight shape or what might be consider ideal (or problematic) size. Is it merely about comfort in the hand? Or are there other considerations, like “grippability” or aerodynamics?
So aside from having a weight between 10g and 11g, what should one look for in an ideal 5A counterweight?