Parts of a Tennis Racket: Every Component and Spec Explained

A tennis racket breaks down into nine core parts: the head, strings, grommets, throat, shaft, beam, handle, grip, and butt cap, plus the bumper guard that protects the frame’s edge. Under ITF Rule 4, a legal racket can’t exceed 73.7 cm (29.0 in) in overall length or 31.7 cm (12.5 in) in width, and the strung hitting surface is capped at 39.4 cm x 29.2 cm (15.5 in x 11.5 in). Everything else — head size, string pattern, weight, balance, and stiffness — is a manufacturer choice within those limits, and each one changes how the racket plays.

The Head (Hoop): Where the Strings Live

The head is the oval frame at the top of the racket that holds the string bed and makes contact with the ball. ITF Rule 4 sets the ceiling on how big a strung hitting surface can legally be — 39.4 cm (15.5 in) long by 29.2 cm (11.5 in) wide — but almost no racket on the market is built to that maximum.

In practice, adult head sizes cluster into three bands:

• Oversized: 105–115 sq in — biggest sweet spot, most forgiving on off-center hits, common for beginners.
• Mid-plus: 98–104 sq in — the standard for most intermediate and advanced club players.
• Mid: 85–97 sq in — smallest sweet spot, used mostly by advanced and tour players who want maximum control.

The Strings and the Sweet Spot

The strings crisscross the head in mains (running lengthwise, toward the handle) and crosses (running side to side). Where they cross, they’re woven or bonded together to form the string bed — the actual surface that contacts the ball. The sweet spot sits just above the string bed’s geometric center, where energy transfer is highest and shock is lowest.

String tension, not just the strings themselves, changes how that bed behaves — lower tension flexes more for extra power, higher tension holds firm for more control. That’s a deep enough topic on its own; see our guide to string tension in tennis for how to pick a number.

The Grommets

Grommets are the small plastic (sometimes rubber) sleeves lining every hole around the frame where a string passes through. They do two jobs: they stop the string from cutting into the graphite or rubbing against a raw edge, and they help distribute tension evenly around the hoop. A cracked or missing grommet is one of the most common reasons a string snaps prematurely at the frame rather than in the middle of the bed.

The Throat

The throat — also called the heart or the yoke — is the open triangular (or Y-shaped) section directly beneath the head, where two shafts converge before meeting the handle. Older wood and early composite rackets often had a closed throat with a bridge across it; virtually every modern racket leaves it open. An open throat cuts weight, reduces wind resistance through the swing, and lets the frame flex slightly for feel without sacrificing stiffness where it matters, at the head.

The Shaft and the Beam

The shaft is the straight section of frame running from the throat down to the handle. Beam width — the actual thickness of the frame, measured in millimeters — is what most directly separates a “power” racket from a “control” racket:

• 19–23mm beam: thinner, more flexible, less power on its own, more player-generated feel. Favored by advanced players.
• 24–30mm+ beam: thicker, stiffer, more inherent power with less swing effort. Common on beginner and “tweener” frames.

The Handle, Grip, and Butt Cap

The handle is the bottom section a player actually holds, built with an eight-sided (octagonal) cross-section so the racket doesn’t twist mid-swing. Two layers sit over that base:

• Grip: the factory-installed wrap, usually leather or a synthetic polymer, that gives the handle its texture and cushioning.
• Overgrip: a thin, tacky layer players add on top of the factory grip for extra feel and easy replacement — most players change overgrips far more often than the base grip underneath.

At the very bottom is the butt cap, a molded plastic piece that seals the end of the handle, stops the racket from sliding out of a sweaty hand mid-swing, and usually carries the brand logo and grip-size stamp.

The Bumper Guard

The bumper guard is the plastic strip that wraps around the top and sides of the head, sitting between the frame and the outer grommets. Every time a racket scrapes the court on a low slice or a mishit clips the frame, the bumper guard takes the damage instead of the graphite underneath. It’s a wear part by design — on well-used rackets, it’s usually the first thing to visibly scuff or crack.

Tennis Racket Parts and Specs at a Glance

Part / Spec	What It Does	Typical Range
Head (hoop)	Holds strings, contacts ball	Max legal: 39.4 x 29.2 cm (15.5 x 11.5 in); typical head size 95–115 sq in
Strings	Generate spin, power, control	Tension 40–65 lbs (18–30 kg), player-dependent
Grommets	Protect strings from frame edge	Full-frame set, replaced with restringing
Throat	Connects head to shaft	Open on nearly all modern rackets
Shaft/Beam	Frame body and thickness	19mm (control) to 30mm+ (power)
Handle	Gripping section	8-sided (octagonal) cross-section
Grip/Overgrip	Comfort, tack, sizing	US 4”–4⅝” (Euro L1–L5)
Butt cap	Seals handle end, prevents slipping	Molded plastic, one piece
Bumper guard	Shields frame from scrapes	Plastic, wraps head’s leading edge
Overall racket	Full-frame legal limit	Max 73.7 x 31.7 cm (29.0 x 12.5 in) — ITF Rule 4

The Buyer’s Specs: Head Size, String Pattern, Weight, Balance, and Stiffness

These five specs decide how a legal racket actually plays, and they’re what most buying guides skip past too quickly.

• Head size controls sweet-spot size: bigger head, more forgiveness on off-center contact; smaller head, more precision but less room for error.
• String pattern is written as mains x crosses — 16x19 is open and spin-friendly, 18x20 is dense and control-oriented, holding tension longer.
• Weight ranges roughly 200–300g (7–10.6 oz) unstrung, up to about 360g (12.6 oz) strung on some tour frames. Heavier rackets absorb pace better; lighter rackets swing faster.
• Balance describes where the mass sits along the frame. A head-heavy racket carries more weight toward the hoop and adds pop on groundstrokes; a head-light racket shifts mass toward the handle for faster maneuverability at net.
• Stiffness, measured on an RA scale, tracks how much the frame flexes at contact. A stiffer frame returns more power with a shorter, more jarring feel; a more flexible frame gives up some pop for a softer, more controllable response.

Why It All Matters on Court

Every part above changes what happens when strings meet ball. A thicker beam and stiffer frame push power toward you automatically, which matters less if your types of tennis shots already generate pace on their own through technique. A denser string pattern holds up better on abrasive surfaces — worth factoring in alongside the different types of tennis courts you play on most, since clay chews through strings differently than a hard court does. And if you’re weighing a switch to squash, padel, or badminton, the same head-throat-shaft-handle anatomy carries over — see our broader look at racket sports for how the specs compare across games.

None of these parts work in isolation. A big head with a thin beam behaves differently than a big head with a thick one; a head-light balance on a heavy frame plays nothing like a head-light balance on a light one. Knowing the parts by name is step one — knowing how they interact is what actually improves your racket choice.