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.