The new Fulling Mill Masterclass Fluorocarbon has the lowest refractory index of any other fluoro on the market, making it the least visible in water to fish. It s also the densest allowing it to cut through the surface tension quicker than ever before. Masterclass has a superb Diameter to Strength ratio so you can rest assured that it s incredibly strong, ultra supple and has great knot strength. With interlocking spools and a tangle-free band, this revolutionary fluorocarbon will certainly help you catch more fish.