The Oregon 109521E Nylium Starline is a high-performance, professional-grade trimmer line designed for heavy-duty use. Featuring a durable co-polymer construction and a distinctive star shape, it offers aggressive cutting action and excellent resistance to breaking and fraying. This line measures 0.095 inches (2.4 mm) in diameter and comes in a 200-foot (61-meter) spool, making it suitable for a wide range of gas and electric string trimmers. The Nylium material ensures long-lasting performance and efficiency in various landscaping and gardening applications.