Hey, what are the best bicep/tricep exercises for mass? I'm happy w/ the way my biceps are (cause they're wide), but my triceps seem "skinny". I mean when I flex them they protrude, but they're not "thick". What exercises would make them thicker/wider?

I'm currently doing skullcrushers, tricep extensions (dumbbell behind the neck, on the seat), and tricep cable pressdowns. I haven't worked out for very long, but I want to use the exercises that are best for thickness (if it even matters, i don't really know). Also I do bar dips at the end of my chest/tri workout.

Even before training, my biceps were thick/round but my triceps aren't. Sorry for overexplaining but I wanted to make sure you know what I'm asking. Thanks