Description: Samson's Vortex is the lightest premium climbing line available in this 1/2 inch size. It has a 24 strand cover like velocity, but it's larger diameter - full 12.7 mm - offers a better grip. Vortex works well with hardware, handles knots, and is great for foot locking. The Vortex is part of the Samson V-Series Premium Climbing Line series.