Orvis Mirage Big Game LeaderSome fluorocarbon fly fishing leaders are blended with nylon, lessening the benefits of abrasion resistance and low visibility. Pure fluorocarbon Mirage has the highest abrasion resistance of any leader or tippet. And its refractive index is so close to that of water that Mirage is virtually invisible. With a specific gravity of 1. 76, it breaks surface tension quickly and sinks quicker than nylon, perfect for nymphing. Fluorocarbon materials retain