I thought 4a had a recognizable curl pattern but was the size of a red coffee stirrer straw. 3b is a half to one inch wide and 3c is similar to the circumference of a pencil or pen. Texture has nothing to do with it. There are 4As with ninkinky hair as there are 3As and 3Bs with kinky hair. By kinky, I mean hair that always has a slightly frizzy or rough look to it, even when properly moisturized.
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3b/c, medium-coarse, low porosity, low density
HG: Jessicurl Too Shea and Kinky Curly Curling Custard
Shampoo: nonsulfate shampoo and Suave Naturals sulfate shampoo when needed