Professional square nylon/aluminum thread 3.5 mm. ( 40 meters) - Shape: square - Thickness: 3.5 mm. -Roll 40 m. -Nylon with aluminum particles, increasing resistance and cutting performance. -Universal use for brush cutters. -Compatible with most electric and gasoline powered brush cutters/brush cutters. -Article known as brushcutting thread, nylon thread for brushcutters.