Nihonto Fluorocarbon Prime 0.30 mm - 30m -- A-grade, high class fluorocarbon, extremely supple and virtually unvisible underwater. Offered in 3 types: SILK- the softest type, PRIME- with the highest knot strength, and QUALITY- the fastest sinking. Available in 10 and 30 meter spools, and 0.12-0.70 diameter.