P-Line C21F-4 C21 Copolymer Clear 300Yd 20lb C21 is the latest addition to the P-Line family and is sure to raise the bar of what anglers can expect from an economically priced line. This copolymer line is made with Japanese raw materials and technology. The ultimate goal of our engineers� was to create a line that bridged the gap between two of our most popular lines, CX-Premium and CXX X-Tra Strong, while maintaining a great price point. Castability is the most important attribute for an angler, and C21 delivers with a soft construction which literally flies off the reel with virtually no memory. A copolymer line made with two types on nylon, C21 synergistically creates the ultimate line for spinning or bait casting reels, without putting a big dent in your wallet!