The best arm workout

I usually do arm workouts with dumbbells and barbells. 

• stretching out and warming up on treadmill
• Dumbell curl: 15 reps x 4 sets with 80% of max weight for both arms. 
• Barbell curl: 15 reps x 4 sets with 80% of max weight . 
• 7 7 7 barbell curl: with 60% of max weight, do 7 reps of barbell curl from bottom to half, then do 7 reps of barbell curl from half to top, and do 7 reps of full barbell curl. 
• Do 4 sets of bicep machine