The phrase "quality of these diapers" refers to how good or well-made the diapers are.
Sentences with «quality of these diapers»
Different quality of diapers will have different number of layers. (diaperpincorner.com)
Absorbency is the most important quality of a diaper, whether it is disposable or cloth. (bestdisposablediapers.com)
I prefer the velcro to the snaps, but really that's personal preference and doesn't make a difference in the quality of the diaper. (diaperjunction.com)