Russo trimmer line is made from high quality BASF materials. All components of this line have been designed for commercial landscape applications. From the quality and strength of the spool itself to the actual materials used to make line, this product is nothing but heavy duty! The 5 pound spool is easy to manage and cost effective with commercial grade quality. 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.