The thickness of a guitar pick is measured in millimeters. As we have pointed out in the buying guide above, there are four types of thickness variations that you can opt between, thin, medium, heavy and extra heavy.
On average, heavier models can produce what can be described as a darker sound than lighter units. Additionally, heavier choices provide you with more control over the notes that you are playing.
Still, when compared to their lighter counterparts, it should be added that heavier picks are a bit more challenging to utilize. This is why novices often prefer lighter picks. Thin picks are best for rhythm guitars but they are not suitable to be used by lead guitarists.
Given the multiple options that are now available online, you can find affordable guitar picks, no matter the design or the level of thickness that you prefer. Before you make any decisions, you should have a good understanding of your playing style.