Here's my routine: 60-90 seconds between sets. Last set of one lift, is usually super-setted with the first of the next.
1. Cross-Body Hammer Curls: 2 sets of 10.
2. Reverse-Grip Preacher Curls(Straight bar): 2 sets of 10.
3. Wrist Curls(Straight Bar or Dbells): 2 sets of 15. Pause at top.
4. Wrist Curls Behind the Back: 2 sets of 15. Pause at top.
5. Reverse Wrist Curls: 2 sets of 15. Pause.
6. Dbell Wrist Curls(standing. dbells at sides, palms facing body. Curling dbells in & up, towards the body). 2 Sets of 15.
You can also through in some hangs, where you just hold onto a straight bar loaded with weight, or from a pullup bar, until failure.
In my opinion, with muscles like these, it is more logical to focus on lactic acid buildup, rather than weight. Go heavy on behind-the-back barbell wrist curls, and you will more than likely find yourself performing a shitty looking shrug. Form, Full range of motion, and lactic acid buildup will have your forearms looking R-I-P-P-E-D after a few weeks.