Good backing can spell the difference between a missed opportunity and your personal best. Rio(R) Dacron(R) Fly-Line Backing is a great choice for most situations thanks to its high strength-to-diameter ratio and incredibly low stretch. In addition, the Dacron material is not woven quite as tightly as some other super-braid materials, which means you get the benefits of a thin, manageable line plus better knotting ability, allowing you to easily make blind splice loops. | RIO Products Fly Line Backing Chartreuse Fly Fishing Line | Size 100 Yard