Do you know the shapes and diameters of your trimmer lines affect on how your weeds are cut?

Trimmer lines come in different shapes and diameter sizes to be used for heavier or lighter jobs. The size of your yard and thickness of your grass should be determined before choosing your line shape or diameter. Different styles of lines can assist you in cutting your job time in half and creating a cleaner, more even cut.

Always refer to your owner’s manual before shopping for trimmer line to determine which line shape and diameter best suits your trimmer.

Trimmer Line Styles

Round shaped Trimmer Line

round trimmer lines

Round Trimmer line is the standard, basic shape that won’t wear down as quickly as other trimmer lines. These trimmer lines are used for lighter, residential use with minimum weeds. Round trimmer line breaks less and is more durable against concrete, trees and etc. to give you an extended use time. This is also the easiest trimmer line to replace in your trimmer.

Multi-sided Trimmer Line

multi-sided trimmer lines

Multi-sided trimmer lines have multiple sides that produce a cleaner cut. These lines commonly come in the shape of a star, square or pentagon. These trimmer lines slice through heavy weeds and thick grass quickly and efficiently, giving you an even cut in less time. However, multi-sided trimmer lines break easy when they come in contact with stones, fences, curbs, sidewalks and etc.

Serrated Trimmer line

saw shaped trimmer lines

With edges that act like teeth or a kitchen knife, this serrated line can quickly saw through grass blades and thick leaves, leaving a cleaner trim. This trimmer line has extra cutting power and can be used for medium-heavy jobs. A serrated trimmer line can cut through weeds easily and quickly to keep your trimming time at a minimum.

Twisted Trimmer Line

Twisted Trimmer Line

Twisted Trimmer line adds strength, improved efficiency and reduces noise levels. This line is a step up from the round style line and offers durability when hitting concrete or hard surfaces. This trimmer line can reduce trimmer vibrations and noise levels while giving you a clean, even cut.

Line Diameter

Trimmer line comes in many different line weights and diameters. A larger diameter will increase your cutting power and durability against thicker grasses and weeds. A lighter weight should be used on areas where there are a minimum of weeds. However, each trimmer can only handle a certain line diameter, check your owner’s manual for model specific recommendations.

Light Work: Residential front and back lawns with lighter weeds.

Medium Work: Larger back and front lawns or lawns with heavier weeds and light commercial work.

Heavy work: Industrial landscaping, large yards, golf courses and other areas that need a large amount of trimming.

Diameter Size:

Light-medium work: 0.065 inches – 0.080 inches

Medium-heavy work: 0.085 inches – 0.105 inches

Very heavy work: 0.110+ inches


When choosing trimmer line determine the thickness of your weeds and the line recommendations in your owner’s manual. With the right trimmer line choice you’ll get a clean, even cut in half the time.