This Stens Silver Streak Edge Trimmer Line features 6 cutting edges, which delivers a cleaner cut with greater uniformity. This trimmer line is recommended for medium to heavy-duty usage, allowing for the trimming of coarse grass and weeds. To enhance its strength, the trimmer line is made from a copolymer formula that blends two different materials. Copolymer trimmer line is more resistant to stretch and breakage. The star-shaped profile of this line exposes grass and weeds to more cutting edges. The end result is that more cutting happens as the trimmer line contacts turfgrass and weeds, producing a more professional landscape appearance. Star-shaped trimmer line has a reputation for more breakage, but the copolymer blend of Stens Silver Streak Edge Trimmer Line reduces that frequency. Silver Streak Edge Trimmer Line comes in green so that break-away pieces blend into the lawn.