how to get bigger arms?

i always see a lot of guys doing biceps curls in the gym. from my experience and reading from various resources, doing biceps curls only is not effective in getting bigger arms.

arms' size is predominantly determined by our genetics. To get bigger biceps, we need to have stronger triceps. If we have strong biceps but weak triceps, muscle imbalance happens. If there i too much muscle imbalance, we will be prone to injure. Our bodies are smart enough and do not allow this to happen. To have strong arms, we need to have strong shoulders. To have strong shoulders, we must have strong chest and back muscles... In short, we must have strong overall body muscles to builder bigger arms.

although the arms' size is difficult to increase without significantly bulking up, it is possible to make the arms appear bigger by using some techniques.
1. reduce body fat- well toned arms appear much larger.
2. doing various biceps and triceps exercises - curls, reverse curls, hammer curls, inclined bench curls, concentration curls, triceps extension, triceps push down, bla-bla-bla... by hitting the arms from different angles, it adds the 3-D effect of the arms muscles.
3. don't struggle to lift heavy, but lift in correct form to maximize muscle tension. slow and controlled movement, maximize contraction at the top, stretch at bottom...
4. stretch between sets