Women's V-neck black Martin logo white T-shirt, M
Women's V-neck black Martin logo white T-shirt, S
T-shirt Black Script logo, Granite Heather, L
T-shirt Black Script logo, Granite Heather, M
Black Script logo T-shirt, Granite Heather, XL
T-shirt + Cap pack, grey and blue, L
Refill per unit - Solid Steel 018
An electric bass string sold individually with a tension of .018 refers to the size of the string measured in inches, specifically its diameter.
Electric bass guitar strings are generally available in different string sizes. The string size is measured in thousandths of an inch or in millimeters. In this case, the string measures .018 inches in diameter.
The size of the string affects the playability, feel, sound and life of the string. Thicker strings tend to have a fuller, richer sound, but can be more difficult to play and may require more pressure on the frets. Thinner strings are easier to play, but may lack some lower frequencies.
It is important to choose the string size that best suits your playing style and tonal preferences.