Most traditional drumsticks are labelled with a number and letter, such as 7A, 5A, 5B or 2B.
The number generally gives you an indication of the stick's diameter and weight. Lower numbers tend to be thicker and heavier, while higher numbers are generally thinner and lighter.
The letter originally referred to the intended application, although these days you can use any stick for any style.
7A
A thin, lightweight stick that's particularly popular for jazz, acoustic music and lighter playing.
Typical diameter: Around 0.540".
Ideal for: Jazz, acoustic, funk and lighter playing.
Feel: Light, quick and responsive.
5A
The classic all-rounder. 5A sticks offer a balance of weight, power and manoeuvrability, making them one of the most popular choices for drummers.
Typical diameter: Around 0.565".
Ideal for: Almost anything.
Feel: Balanced and versatile.
5B
A little thicker and heavier than a 5A, giving you more volume, projection and durability.
Typical diameter: Around 0.590".
Ideal for: Rock, pop, heavier playing and practice.
Feel: Solid, powerful and durable.
2B
A large, heavy stick designed for players who want maximum power and durability.
Typical diameter: Around 0.630".
Ideal for: Metal, hard rock and heavy playing.
Feel: Heavy, powerful and substantial.
These sizes aren't universal across every manufacturer, so a 5A from one brand may feel slightly different from another. It's always worth checking the individual specifications when choosing a new stick.