String Trees Explained – What They Do and the Different Types Used

String trees aren’t the first thing you notice on a guitar. In fact, you may never have paid them much attention. However, these little widgets do in fact play a surprisingly important role in the setup of some guitars.

I say some because, as we’ll see, not every type of guitar has them. Whether or not a guitar or bass requires them is determined by how the headstock is constructed, which we’ll come onto a bit later.

So, as you’ve no doubt realized already, this article is about string trees. We cover what they are, what they do, why they’re required, and the different types that exist.

What are String Trees?

String trees (also known as string retainers or string tees) are small metal widgets that sit on top of the headstock of a guitar.

As I mentioned in the intro, you don’t see them on every type of guitar. You typically only see them on guitars with straight headstocks, such as Strats and Teles (or ‘Fender-style’ guitars) that have headstocks that run parallel to the fretboard.

They are not found on guitars with angled headstocks, like the Gibson Les Paul (or the multitude of Les Paul clones out there).

Here’s what one looks like:

string tree close up
Close up of a string tree – image courtesy of

What do String Trees do?

Keep the Strings firmly in the Nut Slots

If you’ve ever experienced strings buzzing up near the headstock, it’s usually because the strings are too loose in the nut slots. As a result, they vibrate and make an annoying rattle or buzz due to insufficient pressure behind the nut.

To stop this happening, string trees are used. Their primary function is to produce the correct amount of downward pressure on strings so they don’t buzz.

They do this by creating a ‘break angle’ behind the nut, increasing the strings break angle as they pass on their way to the tuner posts.

Guitars with flat headstocks don’t have a natural break angle like tilted headstocks do that keeps the strings firmly slotted in the nut. Conversely, too much pressure can be an issue too. If too much pressure is applied on the string, the nut slot can prematurely wear.

Fender nut break
The slight parallel drop from the fretboard to the tuning headstock on a Fender Strat – image courtesy of

If you look at the contour of a Strat, there’s a slight parallel drop from the fretboard to the tuning headstock, and often the drop is not enough to keep the strings firming in the nut. This causes the strings to pop out if the tension on them isn’t sufficient, especially on thinner strings.

Read any books on the history of Fender, and you’ll know Leo Fender knew he had a great design for mass production when he came up with the flat headstock (it was economical to produce, as it wasted very little wood during production).  The one thing it lacked (where the headstock was concerned, at least) was enough string break.

String trees were his innovative solution.

Create Proper Sustain

String retainers also affect how open strings sound when they’re played. The downward pressure makes sure that strings will sustain properly when played open.

If an open string is loose in the nut slot, it won’t sound as clear or as loud as it should (a bit like if you didn’t fret a string properly).

Guides the Strings

They also work as simple string guides.

With six-in-a-row inline tuners (the sort you find on the Fender Strat), the high strings (D, G, B, and high E) have a greater distance to travel from the nut to the tuning posts.

However, the low and E and A guitar strings don’t need much guidance because the distance traveled from the nut to the tuning posts is pretty short.

Types of String Trees

There are three types of string tree commonly found:

Butterfly Style

The simplest and possibly the most common type of string tree is the butterfly style. It even looks like a tree!

Butterfly String trees
Butterfly string tree – image courtesy of

Barrel Style / Roller Style

Then there is the barrel or roller style string tree. 

roller style string trees
Barrel style / Roller style string tree – image courtesy of

Disc / Round Style

The simplest type is the disc or round style.

Disc string tree
Vintage 50’s Style ‘Disc’ or ‘Round’ String Tree – image courtesy of

As for build material, most are made from metal. However, guitarists who do a lot of bending or use excessive tremolo for cool whammy bar tricks prefer their string trees to be made from graphite rather than metal.

The ‘metal-on-metal’ of a string scraping against a string tree creates a lot of friction that can reduce the string’s ability to return to pitch (causing tuning problems). Graphite provides a slippy, smoother point of contact for the strings to rub up against, producing less friction and reducing the likelihood of the strings going out of tune.

graphite string trees
Graphite string trees are used – image courtesy of Lomcevak

Another solution is to use roller string trees (string trees with built-in rollers) that allow the strings to pass freely, which retaining the tension.


While string trees are probably not the top of your list when it comes to buying a guitar, these tiny guitar parts play an important role in its general health and sound by creating more force on the nut slot and thus reduce the chance of string-buzzing.

Pretty useful little gizmos actually!

Ged Richardson

Ged is editor-in-chief and founder of Zing Instruments. He's a multi-instrumentalist and loves researching, writing, and geeking out about music. He's also got an unhealthy obsession with vintage VW Campervans.