I have 17" arms (nothing great), higher bodyfat so my biceps aren't cut like you would think, but I don't do curls. I do heavy heavy deadlifts, bb rows (supinated grip for better bicep utilization) and supinated pull ups/seated pull downs.
Oh, and squats adds mass to the whole body. I would add a few sets of 10 reps on some curls if you are lacking THAT bad.
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