Gauge sizes in copper electrical wire will get larger as the number gets smaller indicates you 10 AWG has more copper fitted than 12 AWG. Extremely unlikely to choose a supplier with stock on any odd gauge sizes such as 11 or 7 due to the fact difference is so very minor that the application could easily make use of the size above or below the odd size needed. However, when the gauge sizes get larger there's much more room amongst each size which means that odd sizes start staying included at 3 ...