This is Husqvarna's 639 00 51-03 TitaniumForce 1/2 lb .105. The Husqvarna 639 00 51-03 TitaniumForce 1/2 lb .105 is a commercial grade co-polymer trimmer line in a silver color. Husqvarna 639 00 51-03 is a patented design based on cutting edge technology gives longer life, and better performance. Titanium Force thread has fast acceleration, and level flight characteristics, which allows for reduced fuel consumption and makes it run quieter. The Husqvarna 639 00 51-03 TitaniumForce 1/2 lb .105 fits all standard trimmer heads.
