RIO Premier LightLine DT Fly LineA Double Taper Line Designed For Slower Action Rods Especially Bamboo, Glass and "Classic" Action Graphite Rods, With Ultra Slick Performance. RIOs LightLine double taper has been designed to load slower, more traditional action fly rods such as bamboo, glass and the more Classic flexing graphite rods. Built to precisely match the industry line standards, this line will not overload such rods even at longer range. The weight distribution and short