Yo Zuri Duel Big 100% Fluorocarbon 50m Size 7 25lb 50m 0.435mm H3831 (0672)100% fluorocarbon line with high abrasion resistance and low visibility underwater. Size 7 designation matches 25lb breaking strength and 0. 435mm diameter. Low stretch for better hooksets in clear water presentations. Sold in 50m spools. H3831 model designed for general fishing applications where fluorocarbon's sinking properties and stealth are beneficial. TARGET USE: Clear water fishing where line visibility reduction and abrasion resistance are