Any length you want to try. Bullet Bars come with a standard 45 degree thumb index in the bottom for better control especially with bar slants. We will bore bars to reduce weight to your specs. Bored out bars can be filled with a lightweight polymer and baked to restore tone lost in boring. Some important facts to consider.
Heavier bars seem to produce better tone, sustain.
Larger diameters tend to create a slower vibrato with most players. Light, bored bars are easier to manipulate, and can be a real help when starting out. Just decide what you need that is different from production bars, and we can build it for you.