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. Square Trimmer line has 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.