The brush cutter line is made of nylon surface and steel wire core for difficult cutting and long time use. The diameter (thickness) of the grass trimmer cord threads is 3.0mm, 70m length, ideal for replacing the old grass trimmer line. This range of heavy duty 3.0mm replacement tensioners offers powerful, aggressive colors and high visibility colors. The line trimmer lines are designed for 2 or 4 line cutting heads, suitable for brush cutters and lawn mowers. The steel cutting wire can be used in agriculture, landscaping, home gardening and horticulture.