The Ballistic Double Barrel fly line is a double taper with equal front tapers on both ends and a straight middle section. These qualities make for effortless roll casting and makes mending an easier task. One big advantage of a double taper fly line versus a weight forward line is the lack of a head section, which means you can start your cast whenever without having to strip in the line.
Ballistic Double Barrel Fly Line - DT4F - House of Fly
VEX ballistic launcher
spey lines — BALLISTIC FLYLINES
BALLISTIC VECTOR SPEY LINE - PB FlyFishing
Ballistic Pro Performance Floating Fly Line
launcher spey line — BALLISTIC FLYLINES
Ballistic Launcher Spey Line - PB FlyFishing
pro performance single hand line — BALLISTIC FLYLINES
IRS Type 500 'Dragon' Mobile Ballistic Launcher by Target21 on DeviantArt