Teufelberger 7350484 Treemotion Essential Saddle, Medium Sprocket Nose Tooth Count_14 this trimmer head is optimized The Buckingham OX BLOCK this trimmer head is optimized for double line mowing The "Power of Aramid" is brought to bear in this rope structure Features 10 Year Lifetime (from the date of manufacture) Available in 3 Sizes: Small Large Sliding adjustable buckles Ergonomic Design for all body types Openable Side Ring for easy replacement of hip leg connections 4 Attachment Points for chest suspender compatibility Standard thin Back and Leg Padding Maximum Customization for individual needs Double bridges: One longer and one shorter bridge for versatile attachment options